Scientific phenomena named after people

This is a list of scientific phenomena and concepts named after people (eponymous phenomena). For other lists of eponyms, see eponym.

A

 * Abderhalden–Fauser reaction – Emil Abderhalden and August Fauser (1856–1938)
 * Abney effect – William de Wiveleslie Abney
 * Abrikosov lattice – Alexei Alexeyevich Abrikosov
 * Aharonov–Bohm effect – Yakir Aharonov and David Bohm
 * Alfvén wave – Hannes Olof Gösta Alfvén
 * Alhazen's problem – Alhazen
 * Allais effect – Maurice Allais
 * Allee effect – Warder Clyde Allee
 * Amdahl's law, a.k.a. Amdahl's argument – Gene Amdahl
 * Ampère's law – André-Marie Ampère
 * Anderson–Higgs mechanism (a.k.a. Higgs mechanism) – Peter Higgs and Philip Warren Anderson
 * Anderson–Darling test – Theodore Wilbur Anderson and Donald A. Darling
 * Andreev reflection – Alexander F. Andreev
 * Apgar score – Virginia Apgar
 * Arago spot – Dominique François Jean Arago
 * Michaelis–Arbuzov reaction – Aleksandr Erminingeldovich Arbuzov and August Karl Arnold Michaelis
 * Archimedean spiral, Archimedes number – Archimedes
 * Argand diagram – Jean Robert Argand
 * Aristotle's lantern – Aristotle
 * Armstrong limit or Armstrong's line – Harry George Armstrong
 * Armstrong oscillator – Edwin Armstrong
 * Arndt–Eistert synthesis – Fritz Arndt and Bernd Eistert
 * Arndt–Schulz law/principle/rule – Rudolf Arndt and Hugo Paul Friedrich Schulz
 * Arrhenius equation – Svante August Arrhenius
 * Ashkin–Teller model (a.k.a. Potts model) – Julius Ashkin and Edward Teller
 * Asinger reaction – Friedrich Asinger
 * Auger effect (a.k.a. Auger-Meitner effect), electron – Pierre Victor Auger and Lise Meitner
 * Autler–Townes effect – Stanley H. Autler and Charles H. Townes
 * Auwers synthesis – Karl von Auwers
 * Avogadro's law, Avogadro constant, Avogadro number – Count Lorenzo Romano Amedeo Carlo Avogadro di Quaregna e Cerreto

B

 * Baeyer–Drewson indigo synthesis – Johann Friedrich Wilhelm Adolf von Baeyer and Viggo Drewsen
 * Baeyer–Villiger oxidation and Baeyer–Villiger rearrangement – Johann Friedrich Wilhelm Adolf von Baeyer and Victor Villiger
 * Babinet's principle – Jacques Babinet
 * Babler–Dauben oxidation – James Babler and William Garfield Dauben
 * Bagnold number – Ralph Alger Bagnold
 * Baily's beads – Francis Baily
 * Baker–Nathan effect – John William Baker and Wilfred S. Nathan
 * Bakerian mimicry – Herbert G. Baker
 * Baldwin effect (astronomy) – Jack Allen Baldwin
 * Baldwin effect (Baldwinian evolution, Ontogenic evolution) – James Mark Baldwin
 * Baldwin's rules – Jack Edward Baldwin
 * Balmer line, series – Johann Jakob Balmer
 * Bamberger rearrangement – Eugen Bamberger
 * Bamford–Stevens reaction – William Randall Bamford and Thomas Stevens Stevens
 * Barkhausen effect – Heinrich Barkhausen
 * Barnett effect – Samuel Jackson Barnett
 * Barnum effect (a.k.a. Forer effect) – Phineas Taylor Barnum (and Bertram R. Forer)
 * Barton reaction – Derek Harold Richard Barton
 * Barton–McCombie deoxygenation – Derek Harold Richard Barton and Stuart W. McCombie
 * Baskerville effect – the fictional Charles Baskerville of the novel The Hound of the Baskervilles
 * Batesian mimicry – Henry Walter Bates
 * Bauschinger effect – Johann Bauschinger
 * Bayes's theorem – Thomas Bayes
 * Baylis–Hillman reaction – Anthony B. Baylis and Melville E. D. Hillman
 * Bayliss effect – William M. Bayliss
 * BCS superconduction theory – John Bardeen, Leon Cooper, and Robert Schrieffer
 * Beaufort scale (Beaufort wind force scale) – Francis Beaufort
 * Beckmann rearrangement – Ernst Otto Beckmann
 * Beer's law (a.k.a. Beer–Lambert law or Beer–Lambert–Bouguer law) – August Beer (and Johann Heinrich Lambert and Pierre Bouguer)
 * Beilstein's test – Friedrich Konrad Beilstein
 * Bejan number – Adrian Bejan
 * Bekenstein bound – Jacob Bekenstein
 * Bélády's anomaly – László Bélády
 * Bell's inequality – John Stewart Bell
 * Bell number – Eric Temple Bell
 * Belousov–Zhabotinskii reaction – Boris Pavlovich Belousov and Anatol Markovich Zhabotinskii
 * Bénard cell – Henri Bénard
 * Bénard–Marangoni cell/convection (a.k.a. Marangoni convection) – Henri Bénard and Carlo Marangoni
 * Benedict's test – Stanley Rossiter Benedict
 * Benford's law – Frank Albert Benford, Jr.
 * Benioff zone – see Wadati–Benioff zone, below
 * Bennett pinch – Willard Harrison Bennett
 * Berezinsky–Kosterlitz–Thouless transition – Veniamin L. Berezinsky, John M. Kosterlitz, and David J. Thouless
 * Bergman cyclization – Robert George Bergman
 * Bergmann's rule – Carl Bergmann (anatomist)
 * Bergmann–Zervas carbobenzoxy method – Max Bergmann and Leonidas Zervas
 * Bernoulli effect, Bernoulli's equation, principle – Daniel Bernoulli
 * Berry's phase – Michael V. Berry
 * Betz limit – Albert Betz
 * Bezold–Brücke shift (a.k.a. von Bezold spreading effect) – Johann Friedrich Wilhelm von Bezold and Ernst Wilhelm von Brücke
 * Biefeld–Brown effect – Paul Alfred Biefeld and Thomas Townsend Brown
 * Biginelli reaction – Pietro Biginelli
 * Biot number – Jean-Baptiste Biot
 * Biot–Savart law – Jean-Baptiste Biot and Félix Savart
 * Birch reduction – Arthur John Birch
 * Birkeland currents – Kristian Birkeland
 * Bischler–Napieralski reaction – August Bischler and Bernard Napieralski
 * Black's equation for electromigration – James R. Black (d. 2004) of Motorola
 * Blandford–Znajek process – Roger D. Blandford and Roman L. Znajek
 * Blasius boundary layer, flow – Paul Richard Heinrich Blasius
 * Blazhko effect – Sergey Blazhko
 * Bloch electrons – Felix Bloch
 * Bloom filter – Burton Howard Bloom
 * Bodenstein number – Max Bodenstein
 * Bohm sheath criterion – David Bohm
 * Bohr effect – Christian Bohr
 * Bohr magneton, model, radius – Niels Bohr
 * Boltzmann constant – Ludwig Boltzmann
 * Bonnor–Ebert mass – William Bowen Bonnor and Rolf Ebert
 * Borel algebra, measure, set, space, summation, Borel's lemma, paradox – Émile Borel
 * Borel–Cantelli lemma – Émile Borel and Francesco Paolo Cantelli
 * Borel–Carathéodory theorem – Émile Borel and Constantin Carathéodory
 * Born–Haber cycle – Max Born and Fritz Haber
 * Born–Oppenheimer approximation – Max Born and Robert Oppenheimer
 * Borodin–Hunsdiecker reaction – Alexander Borodin, Hienz Hunsdiecker, and Clare Hunsdiecker (née Dieckmann)
 * Borrmann effect (a.k.a. Borrmann–Campbell effect) – Gerhard Borrman (and Herbert N. Campbell)
 * Bortle scale – John E. Bortle
 * Bose–Einstein condensate, effect, statistics – Satyendra Nath Bose and Albert Einstein
 * Boson – Satyendra Nath Bose
 * Boyer's law – Carl Benjamin Boyer
 * Boyle's law (a.k.a. Boyle–Mariotte law) – Robert Boyle (and Edme Mariotte)
 * Brackett line/series – Frederick Sumner Brackett
 * Bradford's law (of scattering) – Samuel C. Bradford
 * Braess's paradox – Dietrich Braess
 * Bragg angle, Bragg's law, Bragg plane – William Henry Bragg and his son William Lawrence Bragg
 * Bragg diffraction – William Lawrence Bragg
 * Brans–Dicke theory – Carl H. Brans and Robert H. Dicke
 * Bravais lattice – Auguste Bravais
 * Bravais–Miller indices (a.k.a. Miller–Bravais indices) – Auguste Bravais and William Hallowes Miller
 * Brayton cycle – George B. Brayton
 * Bredt's rule – Julius Bredt
 * Breit–Wheeler process – Gregory Breit and John A. Wheeler
 * Brewster's angle, law – David Brewster
 * Brillouin zone – Léon Brillouin
 * Brinkman number – Hendrik C. Brinkman
 * Brook rearrangement – Adrian Gibbs Brook
 * Brooks's law (of software development) – Frederick Phillips Brooks, Jr.
 * Brownian motion & Brown(ian) noise – Robert Brown
 * Bucherer reaction – Hans Theodor Bucherer
 * Büchi automata – Julius Richard Büchi
 * Buckingham π theorem – Edgar Buckingham
 * Burali-Forti paradox – Cesare Burali-Forti
 * Bürgi–Dunitz angle – Hans-Beat Bürgi and Jack David Dunitz

C

 * Cabannes–Daure effect – Jean Cabannes and Pierre Daure
 * Cadiot–Chodkiewicz coupling, reaction – Paul Cadiot and Wladyslav Chodkiewicz
 * Callendar effect – Guy Stewart Callendar
 * Callippic cycle – Callippus of Cyzicus
 * Calvin cycle (a.k.a. Calvin–Benson cycle) – Melvin Calvin (and Andy Benson)
 * Cannizzaro reaction – Stanislao Cannizzaro
 * Cardan angles (a.k.a. Tait–Bryan angles) – Gerolamo Cardano
 * Carnot cycle, number – Nicolas Léonard Sadi Carnot
 * Carpenter effect (a.k.a. Ideomotor effect) – William Benjamin Carpenter
 * Cartan–Kähler theorem – Élie Cartan, Erich Kähler
 * Casimir effect – Hendrik Casimir
 * Catalan's conjecture (a.k.a. Mihăilescu's theorem), Catalan numbers – Eugène Charles Catalan
 * Cauchy number (a.k.a. Hooke number) – Augustin-Louis Cauchy
 * Cauchy–Kovalevskaya theorem – Augustin-Louis Cauchy, Sofia Kovalevskaya
 * Cauer filter – Wilhelm Cauer
 * Chandler wobble – Seth Carlo Chandler
 * Chandrasekhar limit, number – Subrahmanyan Chandrasekhar
 * Chang–Refsdal lens – Kyongae Chang and Sjur Refsdal
 * Chaplygin gas – Sergey Alexeyevich Chaplygin
 * Charles's law – Jacques Charles
 * Chebyshev distance, equation, filter, linkage, polynomials – Pafnuty Chebyshev
 * Chebyshev's inequality (a.k.a. Bienaymé–Chebyshev inequality) – Pafnuty Chebyshev (and Irénée-Jules Bienaymé)
 * Cherenkov radiation (a.k.a. Cherenkov–Vavilov radiation) – Pavel Alekseyevich Cherenkov (and Sergey Ivanovich Vavilov)
 * Chichibabin reaction – Alexei Yevgenievich Chichibabin
 * Christiansen effect – Christian Christiansen
 * Christoffel symbol – Elwin Bruno Christoffel
 * Christofilos effect – Nicholas Christofilos
 * Chugaev elimination/reaction, reagent – Lev Aleksandrovich Chugaev
 * Chwolson ring or Chwolson–Einstein ring – Orest Khvolson (and Albert Einstein)
 * Clairaut's relation, theorem – Alexis Claude Clairaut
 * Claisen condensation, rearrangement – Rainer Ludwig Claisen
 * Claisen–Schmidt condensation – Rainer Ludwig Claisen and J. Gustav Schmidt
 * Clapp oscillator – James K. Clapp
 * Clarke orbit – Arthur C. Clarke
 * Clemmensen reduction – Erik Christian Clemmensen
 * Coanda effect – Henri Coanda
 * Coase theorem – Ronald Coase
 * Colburn–Chilton analogy (a.k.a. Colburn analogy) – Allan Philip Colburn and Thomas H. Chilton
 * Coleman–Liau index – Meri Coleman and T. L. Liau
 * Coleman–Mandula theorem – Sidney Coleman and Jeffrey Mandula
 * Collatz conjecture (a.k.a. the Ulam conjecture (Stanisław Ulam), Kakutani's problem (Shizuo Kakutani), the Thwaites conjecture (Sir Bryan Thwaites), Hasse's algorithm (Helmut Hasse), the Syracuse problem) – Lothar Collatz
 * Colpitts oscillator – Edwin H. Colpitts
 * Compton effect, scattering, wavelength – Arthur Compton
 * Compton–Getting effect – Arthur Compton and Ivan A. Getting
 * Conway base 13 function – John H. Conway
 * Coolidge effect – from a joke attributed to John Calvin Coolidge, Jr.
 * Cooper pair – Leon Cooper
 * Cope elimination, rearrangement – Arthur Clay Cope
 * Corey–Fuchs reaction – Elias James Corey and Philip L. Fuchs
 * Corey–Kim oxidation – Elias James Corey and Choung Un Kim
 * Corey–Winter olefin synthesis – Elias James Corey and Roland Arthur Edwin Winter
 * Coriolis effect – Gaspard-Gustave Coriolis
 * Cotton effect – Aimé Auguste Cotton
 * Cotton–Mouton effect – Aimé Auguste Cotton and Henri Mouton
 * Coulomb's law – Charles Augustin de Coulomb
 * Coulter counter, principle – Wallace Henry Coulter
 * Coxeter–Dynkin diagram – Harold Scott MacDonald Coxeter and Eugene Borisovich Dynkin
 * Crabtree effect – Herbert Grace Crabtree
 * Criegee reaction, rearrangement – Rudolf Criegee
 * Curie point – Pierre Curie
 * Curry's paradox – Haskell Curry
 * Curtin–Hammett principle – David Yarrow Curtin and Louis Plack Hammett
 * Curtius rearrangement – Theodor Curtius

D

 * Dakin reaction – Henry Drysdale Dakin
 * Dakin–West reaction – Henry Drysdale Dakin and Randolph West
 * Dalton's law (of partial pressures) – John Dalton
 * Damerau–Levenshtein distance – Frederick J. Damerau and Vladimir Levenshtein
 * Darboux function – Jean Gaston Darboux
 * Darcy's law – Henry Darcy
 * Darlington pair – Sidney Darlington
 * Darwin drift – Charles Galton Darwin
 * Darwin point, Darwinism – Charles Darwin
 * Darzens condensation – Auguste Georges Darzens
 * Davies–Bouldin index (DBI) – David L. Davies and Donald W. Bouldin
 * de Broglie wavelength – Louis de Broglie
 * de Bruijn sequences – Nicolaas Govert de Bruijn
 * de Haas–van Alphen effect – Wander Johannes de Haas and Pieter M. van Alphen
 * de Haas–Shubnikov effect – see Shubnikov–de Haas effect, below
 * Deborah number – the prophetess Deborah (Bible, Judges 5:5)
 * Debye model – Peter Joseph William Debye
 * Debye–Falkenhagen effect – Peter Joseph William Debye and Hans Falkenhagen
 * Richard Dedekind has many topics named after him; see biography article.
 * Delbrück scattering – Max Ludwig Henning Delbrück
 * Delépine reaction – Stéphane Marcel Delépine
 * Dellinger effect (a.k.a. Mögel–Dellinger effect) – John Howard Dellinger (and Hans Mögel)
 * Demjanov rearrangement – Nikolai Jakovlevich Demjanov
 * Dermott's law – Stanley Dermott
 * Dess–Martin oxidation – Daniel Benjamin Dess and James Cullen Martin
 * DeVries solar cycle – See Suess solar cycle, below
 * Dice's coefficient – Lee Raymond Dice
 * Dieckmann condensation – Walter Dieckmann
 * Diels–Alder reaction – Otto Paul Hermann Diels and Kurt Alder
 * Diophantine equation – Diophantus of Alexandria
 * Dirac comb, fermion, spinor, equation, delta function, measure – Paul Dirac
 * Peter Gustav Lejeune Dirichlet has dozens of formulas named after him, see List of things named after Peter Gustav Lejeune Dirichlet
 * Divisia index – François Divisia
 * Doebner–Miller reaction – Oscar Döbner (Doebner) and Wilhelm von Miller
 * Dollo's law – Louis Dollo
 * Donnan effect (a.k.a. Gibbs–Donnan effect) – see Gibbs–Donnan effect, below
 * Doppler effect (a.k.a. Doppler–Fizeau effect), Doppler profile – Christian Doppler (and Hippolyte Fizeau)
 * Downs–Thomson paradox – Anthony Downs and John Michael Thomson
 * Drake equation (a.k.a. Sagan equation, Green Bank equation) – Frank Drake (or Carl Sagan or Green Bank, West Virginia, home to the National Radio Astronomy Observatory (NRAO))
 * Droste effect – Dutch chocolate maker Droste
 * Drude model – Paul Drude
 * Duff's device – Tom Duff
 * Duffing equation, map – Georg Duffing
 * Duhamel's integral, and principle – Jean-Marie Constant Duhamel
 * Dulong–Petit law – Pierre Louis Dulong and Alexis Thérèse Petit
 * Dunitz angle – see Bürgi–Dunitz angle, above
 * Dunning–Kruger effect – David Dunning and Justin Kruger
 * Dyson–Harrop satellite – Brooks L. Harrop and Freeman Dyson

E

 * Early effect – James M. Early
 * Eddington limit – Arthur Eddington
 * Edgeworth–Bowley box – Francis Ysidro Edgeworth and Arthur Lyon Bowley
 * Edison effect – Thomas Edison
 * Edman degradation – Pehr Victor Edman
 * Edward–Lemieux effect (a.k.a. Anomeric effect) – John Thomas Edward and Raymond U. Lemieux
 * Eglinton reaction – Geoffrey Eglinton
 * Ehrenfest paradox – Paul Ehrenfest
 * Eimer's organ – Gustav Heinrich Theodor Eimer
 * Einstein Cross, effect, radius, ring, shift – Albert Einstein
 * Einstein–Chwolson ring or Chwolson ring – Albert Einstein and Orest Khvolson
 * Einstein–de Haas effect – Albert Einstein and Wander Johannes de Haas
 * Einstein–Podolsky–Rosen paradox (a.k.a. EPR paradox, Einstein–Podolsky–Rosen–Bohm paradox) – Albert Einstein, Boris Podolsky, Nathan Rosen (and David Bohm)
 * Ekman layer – Walfrid Ekman
 * Elbs reaction – Karl Elbs
 * Elliott–Halberstam conjecture – Peter D. T. A. Elliott and Heini Halberstam
 * Elman network – Jeff Elman
 * Elsasser number – Walter M. Elsasser
 * Engel curve – Ernst Engel
 * Engelbart's law – Douglas Engelbart
 * Epimenides paradox – Epimenides of Knossos
 * Erlenmeyer flask, rule, synthesis – Richard August Carl Emil Erlenmeyer
 * Eschenmoser fragmentation – Albert Eschenmoser
 * Eschweiler–Clarke reaction – Wilhelm Eschweiler and Hans Thacher Clarke
 * Eshelby's inclusion – John D. Eshelby
 * Étard reaction – Alexandre Léon Étard
 * Ettingshausen effect – Albert von Ettingshausen
 * Euler this and that (numerous entries) – Leonhard Euler
 * Evershed effect – John Evershed

F

 * Faà di Bruno's formula – Francesco Faà di Bruno
 * Faraday constant, effect, Faraday's law of induction, Faraday's law of electrolysis – Michael Faraday
 * Farnsworth–Hirsch fusor – Philo T. Farnsworth and Robert L. Hirsch
 * Favorskii reaction, rearrangement – Alexei Yevgrafovich Favorskii
 * Fenton reaction – Henry John Horstman Fenton
 * Fermat's principle – Pierre de Fermat
 * Fermi energy, paradox, surface, Fermion – Enrico Fermi
 * Fermi–Dirac statistics – Enrico Fermi and Paul Dirac
 * Ferrel cell – William Ferrel
 * Ferrers diagram (a.k.a. Young diagram, Ferrers graph) – Norman Macleod Ferrers
 * Feshbach resonance – Herman Feshbach
 * Feynman diagram – Richard Feynman
 * Finkelstein reaction – Hans Finkelstein
 * Fischer esterification, indole synthesis – Emil Hermann Fischer
 * Fischer–Hafner reaction – Ernst Otto Fischer and Walter Hafner
 * Fischer–Tropsch process – Franz Joseph Emil Fischer and Hans Tropsch
 * Fischer–Hepp rearrangement – Otto Philipp Fischer and Eduard Hepp
 * Fisher distribution – Ronald A. Fisher
 * Fisher equation – Irving Fisher
 * Fisher–Widom line – Michael E. Fisher and Benjamin Widom
 * Fitts's law – Paul M. Fitts
 * Flesch–Kincaid readability test – Rudolf F. Flesch and J. Peter Kincaid
 * Fletcher–Munson curves – Harvey Fletcher and Wilden A. Munson
 * Flynn effect – Jim Flynn
 * Forbush effect – Scott Ellsworth Forbush
 * Forer effect (a.k.a. Barnum effect) – Bertram R. Forer (and Phineas Taylor Barnum)
 * Foucault pendulum – Jean Bernard Léon Foucault
 * Fourier number – Joseph Fourier
 * Fourier series – Joseph Fourier
 * Fourier–Motzkin elimination – Joseph Fourier and Theodore Motzkin
 * Franck–Condon principle – James Franck and Edward Uhler Condon
 * Franssen effect – Nico Franssen
 * Franz–Keldysh effect – Walter Franz and Leonid V. Keldysh
 * Fraunhofer diffraction, lines – Joseph von Fraunhofer
 * Freeman law – Ken Freeman
 * Frenkel line – Jacov Frenkel
 * Fresnel zone – Augustin Fresnel
 * Frey effect – Allan H. Frey
 * Friedel oscillations – Jacques Friedel
 * Friedel–Crafts reaction – Charles Friedel and James Mason Crafts
 * Friedländer synthesis – Paul Friedländer
 * Friedmann–Lemaître–Robertson–Walker metric (a.k.a. Friedmann–Robertson–Walker metric, Robertson–Walker metric) – Alexander Friedmann, Georges Lemaître, Howard P. Robertson and Arthur Geoffrey Walker
 * Fries and photo-Fries rearrangement – Karl Theophil Fries
 * Fritsch–Buttenberg–Wiechell rearrangement – Paul Ernst Moritz Fritsch, Wilhelm Paul Buttenberg, and Heinrich G. Wiechell
 * Frobenius algebra, automorphism, method, norm, theorem – Ferdinand Georg Frobenius
 * Froude number – William Froude
 * Fry readability formula – Edward Fry
 * Fujita scale (a.k.a. F-Scale, Fujita–Pearson scale) – Tetsuya Theodore Fujita (and Allen Pearson)
 * Fujiwhara effect – Sakuhei Fujiwhara

G

 * Gabriel synthesis – Siegmund Gabriel
 * Gardner transition – Elizabeth Gardner
 * Garman limit – Elspeth Garman
 * Gattermann reaction – Ludwig Gattermann
 * Gattermann–Koch reaction – Ludwig Gattermann and Julius Arnold Koch
 * Gaunt factor (or Kramers–Gaunt factor) – John Arthur Gaunt (and Hendrik Anthony Kramers)
 * Gause's principle – Georgii Gause
 * Gauss's law – Carl Friedrich Gauss
 * Gauss–Bonnet gravity, theorem – Carl Friedrich Gauss and Pierre Ossian Bonnet
 * Geib–Spevack process (a.k.a. Girdler sulfide (GS) process) – Karl-Hermann Geib and Jerome S. Spevack (and the Girdler company, which built the first American plant using the process)
 * Geiger counter (a.k.a. Geiger–Müller counter) – Johannes Wilhelm (Hans) Geiger (and Walther Müller)
 * Geiger–Marsden experiment (a.k.a. Rutherford experiment) – Johannes Wilhelm (Hans) Geiger and Ernest Marsden
 * Geiger–Müller tube – Johannes Wilhelm (Hans) Geiger and Walther Müller
 * Geiger–Nuttall law/rule – Johannes Wilhelm (Hans) Geiger and John Mitchell Nuttall
 * Geissler tube – Heinrich Geissler
 * Gibbs entropy, free energy, paradox, Gibbs's phase rule, Gibbs phenomenon – Josiah Willard Gibbs
 * Gibbs–Donnan effect (a.k.a. Donnan effect) – Josiah Willard Gibbs and Frederick G. Donnan
 * Gibbs–Marangoni effect (a.k.a. Marangoni effect) – Josiah Willard Gibbs and Carlo Marangoni
 * Gibbs–Helmholtz equation – Josiah Willard Gibbs and Hermann von Helmholtz
 * Gibbs–Thomson effect – Josiah Willard Gibbs and three Thomsons: James Thomson, William Thomson, 1st Baron Kelvin, Joseph John "J. J." Thomson
 * Giffen good – Robert Giffen
 * Gleissberg solar cycle – Wolfgang Gleißberg
 * Gloger's rule – Constantin Wilhelm Lambert Gloger
 * Goldbach's conjecture – Christian Goldbach
 * Goldstone boson (a.k.a. Nambu–Goldstone boson) – see Nambu–Goldstone boson, below
 * Gomberg–Bachmann reaction – Moses Gomberg and Werner Emmanuel Bachmann
 * Goodhart's law – Charles Goodhart
 * Goos–Hänchen effect or shift – Fritz Goos and Hilda Hänchen
 * Gould Belt – Benjamin Gould
 * Grashof number – Franz Grashof
 * Greisen–Zatsepin–Kuzmin cut-off/limit (a.k.a. GZK cutoff/limit) – Kenneth Greisen, Georgiy Zatsepin and Vadim Kuzmin
 * Gresham's law – Thomas Gresham
 * Griess test (diazotization reaction) – Johann Peter Griess
 * Grignard reaction – François Auguste Victor Grignard
 * Grob fragmentation – Cyril A. Grob
 * Gromov–Witten invariant – Mikhail Gromov and Edward Witten
 * Grosch's law – Herbert Reuben John Grosch
 * Grotrian diagram – Walter Robert Wilhelm Grotrian
 * Grotthuss chain – Christian Johann Dietrich Theodor von Grotthuss
 * Grotthuss–Draper law – Christian Johann Dietrich Theodor von Grotthuss and John William Draper
 * Gunn diode, effect – John Battiscombe "J. B." Gunn
 * Gunning fog index – Robert Gunning
 * Gustafson's law, a.k.a. Gustafson–Barsis's law – John L. Gustafson (and Edward H. Barsis)
 * Gutenberg–Richter law – Beno Gutenberg and Charles Francis Richter

H

 * Haar measure – Alfréd Haar
 * Hadamard inequality – Jacques Solomon Hadamard
 * Hadamard transform (a.k.a. Hadamard–Rademacher–Walsh transform) – Jacques Hadamard, Hans Rademacher, and Joseph L. Walsh
 * Hadley cell – George Hadley
 * Hagedorn temperature – Rolf Hagedorn
 * Haitz's law – Roland Haitz
 * Haldane effect – John Scott Haldane
 * Haldane's principle – John Burdon Sanderson Haldane
 * Hale solar cycle – George Ellery Hale
 * Hall effect – Edwin Hall
 * Hamilton's rule – William Donald "Bill" Hamilton
 * Hamming code, Hamming distance, Hamming weight – Richard Hamming
 * Hammond postulate – George Simms Hammond
 * Hanle effect – Wilhelm Hanle
 * Hardy notation, space – Godfrey Harold Hardy
 * Hardy–Littlewood circle method, first conjecture – Godfrey Harold Hardy and John E. Littlewood
 * Hardy–Weinberg principle – Wilhelm Weinberg and Godfrey Harold Hardy
 * Harrod–Johnson diagram – Roy F. Harrod and Harry G. Johnson
 * Hartley oscillator – Ralph Hartley
 * Hartman effect – Thomas E. Hartman
 * Hartmann mask (or hat) – Johannes Hartmann
 * Hartree energy – Douglas Hartree
 * Hasse's algorithm – see Collatz conjecture, above
 * Hasse diagram, principle – Helmut Hasse
 * Hasse–Minkowski theorem – Helmut Hasse and Hermann Minkowski
 * Hausdorff dimension – Felix Hausdorff
 * Hawthorne effect – from the Hawthorne Works factory (where experiments were carried out 1924–1932)
 * Hayashi track – Chushiro Hayashi
 * Hayflick limit – Leonard Hayflick
 * Hawking radiation (a.k.a. Bekenstein–Hawking radiation) – Stephen Hawking (and Jacob Bekenstein)
 * Heaviside layer – see Kennelly–Heaviside layer
 * Hebbian learning – Donald Olding Hebb
 * Heine–Borel theorem – Heinrich Eduard Heine and Émile Borel
 * Heinlein's razor – see Hanlon's razor, above
 * Heisenberg uncertainty principle – Werner Heisenberg
 * Hellmann–Feynman theorem – Hans Hellmann and Richard Feynman
 * Helmholtz free energy, Helmholtz resonance – Hermann von Helmholtz
 * Hénon map – Michel Hénon
 * Hénon–Heiles system, potential – Michel Hénon and Carl E. Heiles
 * Henrietta's law – see Leavitt's law, below
 * Henyey track – Louis G. Henyey
 * Herbig Ae/Be star – George Herbig
 * Herbig–Haro object – George Herbig and Guillermo Haro
 * Herbrand base, interpretation, structure, universe, and Herbrand's theorem – Jacques Herbrand
 * Hertz effect – Heinrich Rudolf Hertz
 * Hertzsprung–Russell diagram – Ejnar Hertzsprung and Henry Norris Russell
 * Hess afterimage – Carl von Hess
 * Hess diagram – R. Hess
 * Heusler alloy – Fritz Heusler
 * Heyting algebra, arithmetic – Arend Heyting
 * Hick's law, a.k.a. Hick–Hyman law – William Edmund Hick and Ray Hyman
 * Higgs boson, field – Peter Higgs
 * Higgs mechanism – see Anderson–Higgs mechanism, above
 * Hilbert–Waring theorem (a.k.a. Waring's problem) – David Hilbert and Edward Waring
 * Hill sphere (a.k.a. Roche sphere) – George William Hill (and Édouard Roche)
 * Hills cloud – Jack G. Hills
 * Hipparchic cycle – Hipparchus of Nicaea (a.k.a. Hipparchus of Rhodes)
 * Hirayama family – Kiyotsugu Hirayama
 * Hirsch–Meeks fusor – Robert L. Hirsch and Gene A. Meeks
 * Hofstadter's butterfly, law – Douglas Hofstadter
 * Hopfield network – John J. Hopfield
 * Hořava–Lifshitz gravity – Petr Hořava and Evgeny Lifshitz
 * Hořava–Witten domain wall – Petr Hořava and Edward Witten
 * Hubbert peak – Marion King Hubbert
 * Hubble constant, expansion – Edwin Hubble
 * Hubble–Reynolds law – Edwin Hubble and John Henry Reynolds
 * Huchra's Lens – John Huchra
 * Humphreys line/series – Curtis J. Humphreys
 * Hund's Rules – Friedrich Hund
 * Hunsdiecker reaction – Heinz Hunsdiecker and Cläre Hunsdiecker
 * Huygens–Fresnel principle – Christiaan Huygens and Augustin-Jean Fresnel

I

 * Imbert–Fedorov effect – Christian Imbert and Fedor Ivanovič Fedorov
 * Ishikawa diagram – Kaoru Ishikawa
 * Ising model (a.k.a. Lenz–Ising model) – Ernst Ising (and Wilhelm Lenz)

J

 * Jaccard index, similarity coefficient, distance – Paul Jaccard
 * Jaffe profile (or model) – Walter Jaffe
 * Jahn–Teller effect – Hermann Arthur Jahn and Edward Teller
 * Jaro–Winkler distance – Matthew A. Jaro and William E. Winkler
 * Jarque–Bera test – Carlos M. Jarque and Anil K. Bera
 * Jeans's theorem – James Hopwood Jeans
 * Johnson–Nyquist noise – John B. Johnson and Harry Nyquist
 * Jordan's rule/law – David Starr Jordan
 * Josephson constant, effect, junction – Brian David Josephson
 * Joule's law (a.k.a. Joule–Lenz law) – James Prescott Joule and Heinrich Friedrich Emil Lenz
 * Joule–Thomson effect (a.k.a. Joule–Kelvin effect) – James Prescott Joule and William Thomson, 1st Baron Kelvin

K

 * K3 surface – Ernst Kummer, Erich Kähler, Kunihiko Kodaira
 * Kähler differential, manifold, metric – Erich Kähler
 * Kakutani's problem – see Collatz conjecture, above
 * Kármán vortex street – Theodore von Kármán
 * Karnaugh map (a.k.a. Karnaugh–Veitch map, Veitch diagram) – Maurice Karnaugh (and Edward W. Veitch)
 * Karush–Kuhn–Tucker conditions (a.k.a. Kuhn–Tucker conditions) – William Karush, Harold W. Kuhn and Albert W. Tucker
 * Kasha's rule – Michael Kasha
 * Kater's pendulum – Captain Henry Kater
 * Kaye effect – Alan Kaye
 * Keeling curve – Charles David Keeling
 * Kelvin wave – William Thomson, 1st Baron Kelvin
 * Kelvin–Helmholtz mechanism, instability – William Thomson, 1st Baron Kelvin and Hermann von Helmholtz
 * Kelvin–Joule effect (a.k.a. Joule–Thomson effect) – William Thomson, 1st Baron Kelvin and James Prescott Joule
 * Kelvin–Voigt material, model – Woldemar Voigt and William Thomson, 1st Baron Kelvin
 * Kennelly–Heaviside layer – Arthur Edwin Kennelly and Oliver Heaviside
 * Kennicutt–Schmidt law (a.k.a. Schmidt–Kennicutt law, or Schmidt law) – Maarten Schmidt and Robert Kennicutt
 * Kepler's laws of planetary motion – Johannes Kepler
 * Kerr effect – John Kerr
 * Kirkendall effect – Ernest Kirkendall
 * Kleene star (a.k.a. Kleene operator, Kleene closure) – Stephen Kleene
 * Klein–Gordon equation – Oskar Klein and Walter Gordon
 * Klein–Nishina effect – Oskar Klein and Yoshio Nishina
 * Knudsen cell, number – Martin Hans Christian Knudsen
 * Kodaira dimension, embedding theorem, vanishing theorem – Kunihiko Kodaira
 * Koenigs–Knorr reaction – Wilhelm Koenigs and Edward Knorr
 * Kohn effect – Walter Kohn
 * Kohn–Sham equations – Walter Kohn and Lu Jeu Sham
 * Kohonen network – Teuvo Kohonen
 * Kolakoski sequence – William Kolakoski
 * Kolbe electrolysis – Adolph Wilhelm Hermann Kolbe
 * Kolbe–Schmitt reaction – Adolph Wilhelm Hermann Kolbe and Rudolf Schmitt
 * Kondo effect – Jun Kondo
 * Kornblum oxidation – Nathan Kornblum
 * Kornblum–DeLaMare rearrangement – Nathan Kornblum and Harold E. DeLaMare
 * Kossel effect – Walther Kossel
 * Kosterlitz–Thouless transition – see Berezinsky–Kosterlitz–Thouless transition, above
 * Kozai effect – Yoshihide Kozai
 * Krebs cycle – Hans Adolf Krebs
 * Kratzer potential – Adolf Kratzer
 * Kronecker delta – Leopold Kronecker
 * Kuhn–Tucker conditions – see Karush–Kuhn–Tucker conditions, above
 * Kuiper belt – Gerard Kuiper
 * Kummer's function, Kummer surface – Ernst Kummer
 * Kuramoto model – Yoshiki Kuramoto

L

 * Lagrangian mechanics, Lagrange points – Joseph-Louis Lagrange
 * Lamb shift – Willis Lamb
 * Lambert's cosine law (a.k.a. Lambert's emission law) – Johann Heinrich Lambert
 * Landau damping, pole – Lev Davidovich Landau
 * Landau–Pomeranchuk–Migdal effect – Lev Davidovich Landau, Isaak Pomeranchuk, and Arkady Migdal
 * Landau–Zener transition – Lev Davidovich Landau and Clarence Zener
 * Landé g-factor – Alfred Landé
 * Langmuir probe – Irving Langmuir
 * Langmuir–Blodgett film – Irving Langmuir and Katharine B. Blodgett
 * Laplace vector – see Laplace–Runge–Lenz vector, below
 * Laplace–Runge–Lenz vector (a.k.a. LRL vector, Laplace vector, Runge–Lenz vector, Lenz vector) – Pierre-Simon de Laplace, Carl Runge and Wilhelm Lenz
 * Larmor frequency, precession, radius – Joseph Larmor
 * Larsen effect – Søren Absalon Larsen
 * Laspeyres index – Ernst Louis Etienne Laspeyres
 * Leavitt's law (a.k.a. Henrietta's law) – Henrietta Swan Leavitt
 * Le Chatelier's principle – Henri Louis Le Chatelier
 * Lee distance – C. Y. Lee
 * Leidenfrost effect, point – Johann Gottlob Leidenfrost
 * Lenard effect – Philipp Eduard Anton von Lenard
 * Lennard-Jones potential – John Lennard-Jones
 * Lense–Thirring effect (a.k.a. Thirring effect) – Josef Lense and Hans Thirring
 * Lenz vector – see Laplace–Runge–Lenz vector, above
 * Lenz's law – Heinrich Friedrich Emil Lenz
 * Leonard–Merritt mass estimator – Peter Leonard and David Merritt
 * Levenshtein distance, automaton – Vladimir Levenshtein
 * Levi-Civita symbol – Tullio Levi-Civita
 * Lewis–Mogridge Position – David Lewis and Martin J. H. Mogridge
 * Little–Parks effect – William A. Little (physicist) and Roland D. Parks
 * Littlewood–Offord problem – John E. Littlewood and A. Cyril Offord
 * Locard's exchange principle – Edmond Locard
 * Lombard effect – Étienne Lombard
 * London force – Fritz London
 * Lorentz force, transformation – Hendrik Antoon Lorentz
 * Lorentz–Lorenz equation – Hendrik Antoon Lorentz and Ludvig Lorenz
 * Lorenz attractor – Edward Norton Lorenz
 * Lorenz curve – Max O. Lorenz
 * Lorenz gauge condition – Ludvig Lorenz
 * Lorenz–Mie scattering – see Mie scattering, below
 * Loschmidt's paradox – Johann Josef Loschmidt
 * Lotka's law – Alfred J. Lotka
 * Lotka–Volterra equation – Alfred J. Lotka and Vito Volterra
 * Love waves – Augustus Edward Hough Love
 * Lucas critique – Robert Lucas, Jr.
 * Lyapunov's central limit theorem, equation, exponent, fractal, function, stability, test, time and tube – Aleksandr Mikhailovich Lyapunov
 * Lyman line, series – Theodore Lyman

M

 * Mach band/effect, number, principle – Ernst Mach
 * Mach–Zehnder interferometer – Ludwig Mach and Ludwig Zehnder
 * Madelung constant, rule, energy – Erwin Madelung
 * Maggi–Righi–Leduc effect (Thermal Hall effect) – Gian Antonio Maggi, Augusto Righi and Sylvestre Anatole Leduc
 * Magnus effect – Heinrich Gustav Magnus
 * Magorrian relation – John Magorrian
 * Mahalanobis distance – Prasanta Chandra Mahalanobis (প্রশান্ত চন্দ্র মহলানবিস)
 * Mahler measure, Mahler's theorem – Kurt Mahler
 * Malmquist bias, effect – Karl Gunnar Malmquist
 * Malus's law – Étienne-Louis Malus
 * Malthusian parameter – named by Ronald Fisher as a criticism of Thomas Robert Malthus
 * Malthusian catastrophe, growth model – Thomas Robert Malthus
 * Marangoni cell/convection (a.k.a. Bénard–Marangoni convection) – see Bénard–Marangoni cell/convection, above
 * Marangoni effect (a.k.a. Gibbs–Marangoni effect) – see Gibbs–Marangoni effect, above
 * Markov's inequality, chain, partition, Markovian process – Andrey Markov
 * Mathieu functions – Émile Léonard Mathieu
 * Matilda effect – Matilda Joslyn Gage
 * Matthew effect – Matthew the Evangelist
 * Maxwell–Boltzmann distribution – James Clerk Maxwell and Ludwig Boltzmann
 * McCollough effect – Celeste McCollough
 * McCulloch–Pitts neuron – Warren McCulloch and Walter Pitts
 * McGurk effect (a.k.a. McGurk–MacDonald effect) – Harry McGurk (and John MacDonald)
 * Mealy machine – George H. Mealy
 * Meissner effect (a.k.a. Meissner–Ochsenfeld effect) – Walther Meissner (and Robert Ochsenfeld)
 * Mendelian inheritance – Gregor Mendel
 * Mercalli intensity scale (Modified Mercalli scale) – Giuseppe Mercalli
 * Metonic cycle – Meton of Athens
 * Meyers synthesis – Albert I. Meyers
 * Mie scattering (a.k.a. Lorenz–Mie scattering) – Gustav Mie (and Ludvig Lorenz)
 * Mihăilescu's theorem (a.k.a. Catalan's conjecture) – Preda Mihăilescu
 * Mikheyev–Smirnov–Wolfenstein effect – Stanislav Mikheyev, Alexei Smirnov, and Lincoln Wolfenstein
 * Miller effect – John Milton Miller
 * Miller indices (a.k.a. Miller–Bravais indices) – William Hallowes Miller (and Auguste Bravais)
 * Misnay–Schardin effect – Col. József Misnay and Hubert Schardin
 * Mögel–Dellinger effect – see Dellinger effect, above
 * Mohorovičić discontinuity (Moho) – Andrija Mohorovičić
 * Mohr's circle – Christian Otto Mohr
 * Mohr–Coulomb theory – Christian Otto Mohr and Charles-Augustin de Coulomb
 * Mooers's law – Calvin Mooers
 * Moore machine – Edward Forrest Moore
 * Moore's law – Gordon E. Moore
 * Morgan unit – Thomas Hunt Morgan
 * Moreton wave – Gail E. Moreton
 * Morse potential – Philip M. Morse
 * Moses effect – after biblical Moses
 * Mössbauer effect – Rudolf Mössbauer
 * Mott cross section, Mott insulator, Mott transition – Nevill Francis Mott
 * Mpemba effect – Erasto B. Mpemba
 * Müllerian mimicry – Fritz Müller
 * Munroe effect – Charles Edward Munroe
 * Muraour's law – Henri Muraour (1880–1954)
 * Murphy's law – Maj. Edward A. Murphy, Jr.

N

 * Nambu–Goldstone boson (a.k.a. Goldstone boson) – Yoichiro Nambu and Jeffrey Goldstone
 * Nash equilibrium – John Forbes Nash
 * Nassi–Shneiderman diagram – Isaac Nassi and Ben Shneiderman
 * Necker cube – Louis Albert Necker
 * Needleman–Wunsch algorithm – Saul B. Needleman and Christian D. Wunsch
 * Néel temperature – Louis Néel
 * Nernst effect (a.k.a. Nernst–Ettingshausen effect) – Walther Hermann Nernst and Albert von Ettingshausen
 * Nernst equation – Walther Hermann Nernst
 * Neupert effect – Werner Neupert
 * Newcomb's paradox – William Newcomb
 * Newton's rings, Newtonian constant of gravitation, mechanics – Isaac Newton
 * Noether's theorem – Emmy Noether
 * Nordtvedt effect – Kenneth L. Nordtvedt
 * Nyquist frequency, Nyquist rate – Harry Nyquist
 * Nyquist–Shannon sampling theorem (a.k.a. Nyquist–Shannon–Kotelnikov, Whittaker–Shannon–Kotelnikov, Whittaker–Nyquist–Kotelnikov–Shannon, WKS theorem) – Harry Nyquist, Claude Shannon, Edmund Taylor Whittaker, and Vladimir Kotelnikov

O

 * Oberth effect – Hermann Oberth
 * O'Connell effect – Daniel Joseph Kelly O'Connell
 * Olbers's paradox – Heinrich Wilhelm Olbers
 * Ohm's law – Georg Ohm
 * Okun's law – Arthur Okun
 * Omori's law – Fusakichi Omori
 * Onnes effect – Heike Kamerlingh Onnes
 * Oort cloud (a.k.a. Öpik–Oort cloud) – Jan Hendrik Oort (and Ernst Julius Öpik)
 * Ostriker–Peebles criterion – Jeremiah P. Ostriker and Jim Peebles
 * Ostwald's dilution law, Ostwald process – Friedrich Wilhelm Ostwald
 * Overhauser effect – Albert Overhauser
 * Ovshinsky effect – Stanford R. Ovshinsky

P

 * Paal–Knorr synthesis – Carl Paal and Ludwig Knorr
 * Pareto chart, distribution, efficiency, index, principle – Vilfredo Federico Damaso Pareto
 * Pareto–Zipf law (a.k.a. Zipf–Mandelbrot law) – Vilfredo Pareto and George K. Zipf (or Benoît Mandelbrot)
 * Parrondo's games, paradox – Juan Manuel Rodríguez Parrondo
 * Paschen curve, line, law – Friedrich Paschen
 * Paschen–Back effect – Friedrich Paschen and Ernst Back
 * Pasteur effect – Louis Pasteur
 * Paternò–Büchi reaction – Emanuele Paternò and George Büchi
 * Pauli exclusion principle – Wolfgang Pauli
 * Peano curve – Giuseppe Peano
 * Pearson–Anson effect – Stephen Oswald Pearson and Horatio Saint George Anson
 * Péclet number – Jean Claude Eugène Péclet
 * Peltier effect – Jean Charles Athanase Peltier
 * Perlin noise – Ken Perlin
 * Perron–Frobenius theorem – Oskar Perron, and Ferdinand Georg Frobenius
 * Petkau effect – Abram Petkau
 * Petri dish – Julius Richard Petri
 * Petri net – Carl Adam Petri
 * Peyer's patches – Johann Conrad Peyer
 * Pfeiffer effect – Paul Pfeiffer
 * Pfund line/series – August Herman Pfund
 * Phillips curve – William Phillips (economist)
 * Pigou effect – Arthur Cecil Pigou
 * Piobert's law – Guillaume Piobert (1793–1871)
 * Pisot–Vijayaraghavan number – Charles Pisot and Tirukkannapuram Vijayaraghavan
 * Planck constant, length, mass, time – Max Planck
 * Platonic year – Plato
 * Pockels effect – Friedrich Carl Alwin Pockels
 * Pogson ratio – Norman Robert Pogson
 * Poincaré map, section – Henri Poincaré
 * Poincaré–Bendixson theorem – Henri Poincaré and Ivar Otto Bendixson
 * Poinsot's spirals – Louis Poinsot
 * Polchinski's paradox – Joseph Polchinski
 * Potts model (a.k.a. Ashkin–Teller model) – Renfrey B. Potts, Julius Ashkin, and Edward Teller
 * Pourbaix diagram – Marcel Pourbaix
 * Poynting effect, vector – John Henry Poynting
 * Poynting–Robertson effect – John Henry Poynting and Howard P. Robertson
 * Prandtl number – Ludwig Prandtl
 * Primakoff effect – Henry Primakoff
 * Proteus phenomenon – Proteus (mythological god)
 * Pulfrich effect – Carl P. Pulfrich
 * Purkinje effect/shift – Johannes Evangelista Purkinje
 * Pygmalion effect (a.k.a. Rosenthal effect, observer-expectancy effect) – Pygmalion (and Robert Rosenthal)
 * Pythagorean theorem (a.k.a. Pythagoras's theorem) – Pythagoras

R

 * Rabi oscillations – Isidor Isaac Rabi
 * Rademacher distribution, function, series, sum – Hans Adolph Rademacher
 * Rademacher–Menchov theorem – Hans Adolph Rademacher and Dmitrii Menshov
 * Radon transform – Johann Karl August Radon
 * Raman scattering – Chandrasekhara Venkata Raman
 * Ramsauer–Townsend effect (a.k.a. Ramsauer effect, Townsend effect) – Carl Ramsauer and John Sealy Townsend
 * Ramsden circle/disc/eyepoint, eyepiece – Jesse Ramsden
 * Ramsey theory – Frank Plumpton Ramsey
 * Rapoport's rule – Eduardo H. Rapoport
 * Raychaudhuri's equation – Amal Kumar Raychaudhuri (অমল কুমার রায়চৌধুরী)
 * Raygor Estimate Graph – Alton L. Raygor
 * Rayleigh criterion, distribution, fading, number, quotient, scattering, waves – Lord Rayleigh
 * Rayleigh–Bénard cell/convection – Lord Rayleigh and Henri Bénard
 * Rayleigh–Jeans law – Lord Rayleigh and James Jeans
 * Rayleigh–Taylor instability – Lord Rayleigh and G. I. Taylor
 * Rees–Sciama effect – Martin Rees and Dennis Sciama
 * Reidemeister moves – Kurt Reidemeister
 * Résal effect – Louis-Jean Résal
 * Rescorla–Wagner rule – Robert A. Rescorla and Allan R. Wagner
 * Reynolds number, Reynolds analogy – Osborne Reynolds
 * Ribot's law (of Retrograde Amnesia) – Théodule-Armand Ribot
 * Ricardian equivalence (a.k.a. Barro–Ricardo equivalence, or Ricardo–de Viti–Barro equivalence) – Robert Barro, David Ricardo, and Antonio de Viti de Marco
 * Richards controller – Charles L. Richards
 * Richardson's constant, equation, law – Owen Willans Richardson
 * Richardson number – Lewis Fry Richardson
 * Richter magnitude scale – Charles Francis Richter
 * Righi–Leduc effect (a.k.a. Leduc–Righi effect) – Augusto Righi and Sylvestre Anatole Leduc
 * Ringelmann effect – Max Ringelmann
 * Robertson–Walker metric (a.k.a. Friedmann–Robertson–Walker metric) – see Friedmann–Lemaître–Robertson–Walker metric, above
 * Roche limit – Édouard Roche
 * Roche sphere (a.k.a. Hill sphere) – Édouard Roche (and George William Hill)
 * Rollin film – Bernard V. Rollin
 * Rosenthal effect (a.k.a. Pygmalion effect, observer-expectancy effect) – Robert Rosenthal (and Pygmalion)
 * Rossby waves – Carl-Gustaf Arvid Rossby
 * Rossi–Forel scale – Michele Stefano Conte de Rossi and François-Alphonse Forel
 * Rössler equation – Otto Rössler
 * Rossmann fold – Michael Rossmann
 * Royer oscillator – George H. Royer
 * Ruelle operator, zeta function – David Ruelle
 * Ruelle–Perron–Frobenius theorem – David Ruelle, Oskar Perron, and Ferdinand Georg Frobenius
 * Ruhmkorff coil – Heinrich D. Ruhmkorff
 * Runge–Lenz vector – see Laplace–Runge–Lenz vector
 * Runge's phenomenon – Carle David Tolmé Runge
 * Russell's paradox – Bertrand Russell
 * Rutherford experiment (a.k.a. Geiger–Marsden experiment), scattering – Ernest Rutherford
 * Rybczynski theorem – Tadeusz Rybczynski
 * Rydberg constant, formula – Johannes Rydberg
 * Rydberg–Klein–Rees method – Johannes Rydberg, Oskar Klein, and Albert Lloyd George Rees

S

 * Sabatier or Sabattier effect – Sabat[t]ier, first name unknown
 * Sachs–Wolfe effect – Rainer K. Sachs and Arthur M. Wolfe
 * Saffir–Simpson hurricane wind scale – Herbert S. Saffir and Robert ("Bob") Simpson
 * Sagnac effect – Georges Sagnac
 * Saha ionization equation (a.k.a. Saha–Langmuir equation) – Megh Nad Saha (মেঘনাদ সাহা) (and Irving Langmuir)
 * Salem number – Raphaël Salem
 * Sapir–Whorf hypothesis – Edward Sapir and Benjamin Whorf
 * Sasakian manifold, metric – Shigeo Sasaki
 * Say's law – Jean-Baptiste Say
 * Scheerer's phenomenon (Blue field entoptic phenomenon) – Richard Scheerer
 * Schering Bridge – Harald Schering
 * Schild plot, regression analysis – Heinz Otto Schild
 * Schmidt law, Schmidt–Kennicutt law – see Kennicutt–Schmidt law, above
 * Schottky effect – Walter H. Schottky
 * Schröter effect – Johann Hieronymus Schröter
 * Schülen–Wilson effect – see Wilson effect, below
 * Schuler period, tuning – Maximilian Schuler
 * Schultz's rule – Adolph Hans Schultz
 * Schumann–Runge bands – Victor Schumann and Carle David Tolmé Runge
 * Schwabe solar cycle – Samuel Heinrich Schwabe
 * Schwarzschild effect, metric, radius – Karl Schwarzschild
 * Scott effect – Elizabeth L. Scott
 * Secchi (stellar) class, depth, disk – Pietro Angelo Secchi
 * Seebeck effect – Thomas Johann Seebeck
 * Seiberg–Witten gauge theory – Nathan Seiberg and Edward Witten
 * Seiberg–Witten invariant – Nathan Seiberg and Edward Witten
 * Senftleben–Beenakker effect – Hermann Senftleben and Jan J. M. Beenakker
 * Sertoli cells – Enrico Sertoli
 * Serre duality – Jean-Pierre Serre
 * Seyfert galaxy – Carl Keenan Seyfert
 * Shapiro effect – Irwin Shapiro
 * Shimizu–Morioka attractor, equations – Tatsujiro Shimizu and Nozomi Morioka
 * Shubnikov–de Haas effect – Wander Johannes de Haas and Lev Vasiljevich Shubnikov
 * Sieberg tsunami intensity scale – August Heinrich Sieberg
 * Sieberg–Ambraseys tsunami intensity scale – August Heinrich Sieberg and Nicholas Ambraseys
 * Simmons–Smith reaction – Howard Ensign Simmons, Jr.
 * Simpson's paradox (a.k.a. Yule–Simpson effect) – Edward H. Simpson (and Udny Yule)
 * Simroth's organs – Heinrich Rudolf Simroth
 * Smale's horseshoe – Stephen Smale
 * Smale–Rössler theorem – Stephen Smale and Otto Rössler
 * Smith–Waterman algorithm – Temple F. Smith and Michael S. Waterman
 * Snell's law – Willebrord van Roijen Snell
 * Soloviev tsunami intensity scale – Sergey L. Soloviev
 * Sommerfeld–Kossel displacement law – Arnold Sommerfeld and Walther Kossel
 * Sørensen similarity index, similarity coefficient – Thorvald Sørensen
 * Spörer's law, Spörer Minimum – Gustav Spörer
 * St. Elmo's fire – Erasmus of Formiae
 * St. Robert's law (a.k.a. Vieille's law) – Comte Paul Ballada de Saint-Robert, a.k.a. Conte Paolo Ballada di San Roberto (1815–1888)
 * Staebler–Wronski effect – David L. Staebler and Christopher R. Wronski
 * Stark effect (a.k.a. Stark–Lo Surdo effect) – Johannes Stark (and Antonino Lo Surdo)
 * Stark ladder (a.k.a. Wannier–Stark ladder, q.v.) – Johannes Stark and Gregory Hugh Wannier
 * Stark–Einstein law – Johannes Stark and Albert Einstein
 * Stebbins–Whitford effect – Joel Stebbins and Albert Edward Whitford
 * Stefan's constant, law (a.k.a. Stefan–Boltzmann constant, law) – Jožef Stefan (and Ludwig Boltzmann)
 * Stensen's duct – Niels Stensen
 * Stern–Levison parameter – S. Alan Stern and Harold F. Levison
 * Stevens effect – Joseph C. and Stanley Smith Stevens
 * Stevens's power law – Stanley Smith Stevens
 * Stewart's organs – Charles Stewart
 * Stewart–Tolman effect – Thomas Dale Stewart and Richard Chace Tolman
 * Stigler's law of eponymy – Stephen Stigler
 * Stirling number – James Stirling
 * Stokes radius – George Gabriel Stokes
 * Stokes shift – George Gabriel Stokes
 * Stolper–Samuelson theorem – Paul Samuelson and Wolfgang Stolper
 * Strömgren age, photometry, sphere – Bengt Georg Daniel Strömgren
 * Strömgren–Crawford photometry – Bengt Georg Daniel Strömgren and David L. Crawford
 * Stroop effect – John Ridley Stroop
 * Strouhal number – Vincenc Strouhal
 * Stueckelberg action – Ernst Carl Gerlach Stueckelberg
 * Sturgeon's law – Theodore Sturgeon
 * Sturmian trajectories – Charles François Sturm
 * Suess effect – Hans Eduard Suess
 * Suess solar cycle, DeVries solar cycle, Suess-DeVries solar cycle – Hans Eduard Suess and Hessel de Vries
 * Sunyaev–Zel'dovich effect – Rashid Sunyaev and Yakov Zel'dovich
 * Syracuse problem – see Collatz conjecture, above
 * Szilard–Chalmers effect – Leó Szilárd and Thomas A. Chalmers

T

 * Tait–Bryan angles (a.k.a. Cardan angles, nautical angles) – Peter Guthrie Tait and George H. Bryan
 * Talbot effect – William Henry Fox Talbot
 * Tanimoto coefficient, distance, measure, score, similarity – Taffee T. Tanimoto
 * Taylor cone – Geoffrey Ingram Taylor
 * Taylor-Couette flow – Geoffrey Ingram Taylor and Maurice Marie Alfred Couette
 * Teller–Ulam design – Edward Teller and Stanislaw Ulam
 * Thévenin's theorem – Léon Charles Thévenin
 * Thirring effect – see Lense–Thirring effect, above
 * Thomas precession – Llewellyn Thomas
 * Thomas–Fermi approximation, model – Llewellyn Hilleth Thomas and Enrico Fermi
 * Thomson cross-section, effect – William Thomson, 1st Baron Kelvin
 * Thomson structure (a.k.a. Widmanstätten pattern) – William (Guglielmo) Thomson (or Count Alois von Beckh Widmanstätten)
 * Thorndike's laws (of effect, readiness, and exercise) – Edward L. Thorndike
 * Thorson's rule – Gunnar Thorson
 * Thouless energy – David J. Thouless
 * Thwaites conjecture – see Collatz conjecture, above
 * Tiedemann's bodies – Friedrich Tiedemann
 * Tiffeneau–Demjanov rearrangement – Marc Tiffeneau and Nikolai Demyanov
 * Tobin's q – James Tobin
 * Tolman effects – Richard Chace Tolman
 * Tolman–Oppenheimer–Volkoff limit – Richard Chace Tolman, J. Robert Oppenheimer, and George Michael Volkoff
 * Tonks–Girardeau gas – Lewi Tonks and Marvin D. Girardeau
 * Townsend effect (a.k.a. Ramsauer effect, Ramsauer–Townsend effect), ionization coefficient – John Sealy Townsend
 * Troxler's effect/fading – Ignaz Paul Vital Troxler
 * Tychonoff space – Andrey Nikolayevich Tychonoff
 * Tyndall effect/scattering – John Tyndall

U

 * Ulam conjecture – see Collatz conjecture
 * Ulam's packing conjecture – Stanislaw Ulam
 * Unruh effect – William G. Unruh

V

 * Vackář oscillator – Jirí Vackář
 * Van Allen radiation belt – James Van Allen
 * Van de Graaff generator – Dr. Robert Jemison Van de Graaff
 * Van der Pol equation, oscillator – Balthasar van der Pol
 * Van der Waals force – Johannes Diderik van der Waals
 * Van Hove singularity – Léon Van Hove
 * Vavilovian mimicry – Nikolai Ivanovich Vavilov
 * Veblen effect – Thorstein Veblen
 * Veitch diagram – see Karnaugh map, above
 * Venturi effect – Giovanni Battista Venturi
 * Venn diagram – John Venn
 * Vieille's law (a.k.a. St. Robert's law, often misspelled as Vielle's law) – Paul Marie Eugène Vieille
 * Vierordt's law – Karl von Vierordt
 * Vogel-Fulcher-Tammann equation – Hans Vogel, Gordon Scott Fulcher, and Gustav Tammann
 * Vogt–Russell theorem – Heinrich Vogt and Henry Norris Russell
 * Voigt effect, notation, profile – Woldemar Voigt
 * Voigt material – see Kelvin–Voigt material, above
 * Von Klitzing constant – Klaus von Klitzing
 * Von Neumann ordinal, von Neumann architecture – John von Neumann
 * Von Restorff effect – Hedwig von Restorff
 * Von Zeipel theorem – Edvard Hugo von Zeipel

W

 * Wadati–Benioff zone (a.k.a. Benioff zone) – Kiyoo Wadati and Hugo Benioff
 * Wahlund effect – Sten Gösta William Wahlund
 * Wallace's line – Alfred Russel Wallace
 * Walras's law – Léon Walras
 * Wannier function, orbital – Gregory Wannier
 * Wasserman 9-Panel Plot – Karlman Wasserman
 * Wannier–Stark ladder (a.k.a. Stark ladder) – Gregory Wannier and Johannes Stark
 * Warburg effect – Otto Warburg
 * Waring's problem (a.k.a. Hilbert–Waring theorem) – Edward Waring (and David Hilbert)
 * Weber–Fechner law (Weber's law, Fechner's law) – Ernst Heinrich Weber and Gustav Theodor Fechner
 * Weberian apparatus – Ernst Heinrich Weber
 * Weierstrass–Casorati theorem – Karl Theodor Wilhelm Weierstrass and Felice Casorati
 * Weierstrass's elliptic functions, factorization theorem, function, M-test, preparation theorem – Karl Theodor Wilhelm Weierstrass
 * Wien bridge – Max Wien
 * Weissenberg effect – Karl Weissenberg
 * Wess–Zumino–Witten model – Julius Wess, Bruno Zumino and Edward Witten
 * Wess–Zumino model – Julius Wess, Bruno Zumino
 * Westermarck effect – Edvard Westermarck
 * Weston cell – Edward Weston
 * Wheatstone bridge – Charles Wheatstone (improved and popularized it; the inventor was Samuel Hunter Christie)
 * Whittaker function, integral, model – Edmund Taylor Whittaker
 * Whittaker–Shannon interpolation formula – Edmund Taylor Whittaker, John Macnaghten Whittaker, Claude Shannon
 * Widmanstätten pattern (a.k.a. Thomson structure) – Count Alois von Beckh Widmanstätten (or William (Guglielmo) Thomson)
 * Widom line – Benjamin Widom
 * Widrow–Hoff least mean squares filter – Bernard Widrow and Ted Hoff
 * Wiedemann–Franz law – Gustav Wiedemann and Rudolf Franz
 * Wiegand effect – John R. Wiegand
 * Wien bridge (Wien's bridge), constant, effect, law – Wilhelm Wien
 * Wiener filter, process – Norbert Wiener
 * Wigmore chart – John Henry Wigmore
 * Wigner energy, Wigner effect – Eugene Wigner
 * Wigner–Seitz cell – Eugene Wigner and Frederick Seitz
 * Wilson cycle – John Tuzo Wilson
 * Wilson effect – Alexander Wilson
 * Wilson–Bappu effect – Olin Chaddock Wilson and Manali Kallat Vainu Bappu
 * Witten index – Edward Witten
 * Wollaston prism – William Hyde Wollaston
 * Woodward–Hoffmann rules – Robert Burns Woodward and Roald Hoffmann
 * Wolf effect – Emil Wolf
 * Wulf bands – Oliver R. Wulf
 * Wulff–Dötz reaction – William Wulff and Karl Heinz Dötz

Y

 * Yarkovsky effect – Ivan Osipovich Yarkovsky
 * YORP effect – Ivan Osipovich Yarkovsky, John A. O'Keefe, Vladimir Vyacheslavovich Radzievskii, and Stephen J. Paddack
 * Young diagram (a.k.a. Ferrers diagram), Young tableau – Alfred Young
 * Young's modulus – Thomas Young
 * Yule–Simpson effect (a.k.a. Simpson's paradox) – Edward H. Simpson and Udny Yule

Z

 * Zeeman effect – Pieter Zeeman
 * Zeigarnik effect – Bluma Zeigarnik
 * Zener effect – Clarence Melvin Zener
 * Zeno effect – Zeno of Elea
 * Zipf's law – George K. Zipf
 * Zipf–Mandelbrot law (a.k.a. Pareto–Zipf law) – George K. Zipf and Benoît Mandelbrot (or Vilfredo Pareto)