Rex

Rex or REX may refer to:
 * Rex (title) (Latin: king, ruler, monarch), a royal title
 * King of Rome (Latin: Rex Romae), chief magistrate of the Roman Kingdom

Dogs

 * Rex (Ronald Reagan's dog)
 * Rex (search and rescue dog), a dog that received a 1945 Dickin Medal for bravery

Other animals

 * -rex, a taxonomic suffix used to describe certain large animals
 * Tyrannosaurus rex, a large predatory cretaceous dinosaur
 * Rex (horse) or Rex the Wonder Horse, star of 15 Hollywood motion pictures
 * Rex rabbit, a breed of rabbit
 * Rex mutation, a type of mutation affecting the fur of the rex rabbit
 * One of at least three types of rabbit fur collectively known as "rex fur"

Computing and technology

 * REX prefix, used by the x86-64 instruction encoding
 * Rexx (originally named Rex), a computer programming language
 * REX, an audio file format; see REX2
 * .rex (disambiguation), file extension used by Rexx scripts and REX2 audio files
 * REX 5000, a series of personal digital assistants
 * REX 6000, a series of personal digital assistants
 * Rex (software), a remote execution, configuration management and software deployment system
 * Rex (video game), a 1988 game for the ZX Spectrum and Amstrad CPC
 * REX OS, a real-time operating system developed by Qualcomm
 * Samsung REX, a series of affordable feature phones
 * REX, an abbreviation for "request to exit", a push-button or motion detector used for access control

Energy and fuels

 * Rockies Express Pipeline, a natural gas pipeline built across the United States
 * Rex Energy, a defunct company engaged in natural gas exploration
 * Rex International Holding Limited, an oil and gas company headquartered in Singapore

Film

 * Rex Lewis, a character from G.I. Joe: The Rise of Cobra
 * Rex Manning, the former 80s pop idol in the 1995 film Empire Records
 * Rex (Toy Story), a toy dinosaur character from Disney/Pixar's Toy Story series
 * Rex, the sheepdog from the 1995 Academy Award-winning film Babe
 * Rex, a Tyrannosaurus Rex, a character in animated film We're Back! A Dinosaur's Story
 * Rex Kwon Do, a martial arts choreographer in the 2004 cult film Napoleon Dynamite
 * Rex, Lori's boss in the film Ted
 * Rex Motion Picture Company, was an early film production company in the United States from 1910 into 1917
 * Rex (film), alternative name for Megan Leavey, 2017

Animated television series

 * Rex Banner, a one-time character in The Simpsons appearing in the episode "Homer vs. the Eighteenth Amendment"
 * Rex Raptor, a recurring character in the 4kids version of Yu-Gi-Oh!
 * Rex Salazar, the main title character from the animated show Generator Rex
 * Rex, the title character in the claymation series Rex the Runt
 * Rex, a character in the Canadian animated series Animal Mechanicals
 * Captain Rex, the clone trooper captain who served as General Anakin Skywalker's second-in-command in the series Star Wars: The Clone Wars

Live-action television series

 * Rex Balsom, a character on the soap opera One Life to Live
 * Rex Brady, a character on the soap opera Days of Our Lives
 * Rex Buckland, a character in the series Charmed
 * Rex (police dog), a fictional character from the police drama television series Inspector Rex
 * Rex (Slovak TV series), a 2017 series based on the Austrian original
 * Rex Van de Kamp, a character in the series Desperate Housewives
 * Rex Britten, a character in the series Awake
 * Rex Powers, a dummy in the series Victorious
 * Rex, a canine character in the Canadian police procedural drama series Hudson & Rex
 * Rex Mohs, a character from Scott the Woz

Other fiction

 * Metal Gear REX, a mecha from the video game Metal Gear Solid
 * Rex the Wonder Dog, a DC Comics superhero dog
 * Rex Fury, one of the main antagonists from the video game Lego City Undercover
 * Rex Morgan, M.D., a comic strip and its title character
 * Rex, the main protagonist and player character from the video game Xenoblade Chronicles 2
 * Lord Rex, a super evolve Vivosaur character from the sequel video game Fossil Fighters: Champions
 * Rex Mason, a DC Comics superhero known as Metamorpho

Music

 * Rex (musical), a stage musical, with music by Richard Rodgers and lyrics by Sheldon Harnick
 * Rex (band), an alternative rock band
 * Rex (Live at the Fillmore), a 2008 album by Keller Williams, Keith Moseley and Jeff Austin
 * Rex Records (disambiguation), several record companies
 * Rex Orange County, an English recording artist and songwriter

People

 * Rex (given name), for people with the given name
 * Rex (surname), for people with the surname
 * Rex (artist), American gay pornographic artist
 * Rex (singer), Li Xinyi (born 1998), Chinese singer and songwriter
 * Mad Dog Rex, professional wrestler from All-Star Wrestling

Places

 * Rex, Georgia, an unincorporated community in the United States
 * Rex, North Carolina, a census-designated place in the United States
 * Rex River, Washington, United States
 * Mount Rex, an isolated mountain in Antarctica

Air

 * Dudek Rex, a Polish paraglider design
 * Rex Airlines, an Australian airline
 * The IATA airport code for the General Lucio Blanco International Airport in Reynosa, Mexico
 * Reporting name for the Kawanishi N1K Japanese Fighter

Land

 * BMW i3 REx, range extender variant of the all-electric BMW i3
 * Subaru Rex, a Japanese Kei car
 * Subaru Impreza WRX, a car referred to as "Rex"
 * Rex-Acme, a premier British motorcycle company of early 1900s, originally Rex
 * Rex (automobile) of Detroit, c. 1914
 * Rex-Simplex and Rex, brand names used by the German company Hering & Richard which produced motor vehicles between 1901 and 1923

Sea

 * SS Rex, an Italian luxury ship, sunk by Allied bombers off the coast of Slovenia in 1944
 * SS Rex, a floating casino off the coast of Southern California from the late 1930s to the late 1940s, run by mobster Anthony Cornero

Other uses

 * Rex (krewe), the Rex Organization, an old-line Mardi Gras krewe
 * Rex, king of the New Orleans Mardi Gras Carnival
 * Rex Architecture P.C., an architecture and design firm based in New York City, United States
 * Rex 84, a plan by the United States to test their ability to detain large numbers of American citizens
 * Rex (chair), a foldable chair
 * Rex, the dinosaur mascot of the Calgary Dinos athletic teams at the University of Calgary
 * MP412 REX, a Russian handgun
 * REX, the Regents External Degree program, a former name of Excelsior College
 * Rex Center, a former building in Lowell, Massachusetts
 * Oligosaccharide reducing-end xylanase, an enzyme
 * REX (New Horizons), a radio science experiment on the Pluto flyby space probe