M3

M3, M-3 or M03 may refer to:

Computing and electronics

 * Apple M3, a central processing unit in the Apple M series
 * Intel m3, a brand of microprocessors
 * M.3 (aka NF1/NGSFF), a specification for internally mounted expansion cards
 * Leica M3, a landmark 35mm rangefinder camera
 * Modula-3 (M3), a programming language
 * M3, a British peak programme meter standard used for measuring the volume of audio broadcasts
 * m3, a macro processor for the AP-3 minicomputer, the predecessor to m4
 * M3, a surface-mount version of the 1N4003 general-purpose silicon rectifier diode
 * M3 (email client), an unreleased email client for the Vivaldi browser

Entertainment

 * M3, a comic book created by Vicente Alcazar
 * M3 adapter, a Game Boy Advance movie player
 * M3 (Canadian TV channel), a music and entertainment television channel
 * M3 (Hungarian TV channel), a Hungarian television channel
 * M3: Malay Mo Ma-develop, a 2010 Philippine TV series
 * M3 Music Card, a 2007 flash-based MP3 player
 * M3 Perfect, M3 Simply and M3 Real, Nintendo DS and 3DS storage devices
 * M3: Sono Kuroki Hagane, a 2014 Japanese anime television series

Weapons

 * 37 mm Gun M3, a light American anti-tank gun
 * M3/M3E1 Multi-role Anti-armor Anti-tank Weapon System (MAAWS) (AKA: Carl Gustaf 8.4cm recoilless rifle), an 84 mm man-portable reloadable anti-tank recoilless rifle
 * 90 mm Gun M1/M2/M3, an American anti-aircraft and anti-tank gun
 * 105 mm Howitzer M3, an American light artillery piece
 * Benelli M3 Super 90, an Italian semi-automatic shotgun
 * M3 20mm cannon, a United States development of the Hispano-Suiza HS.404
 * M3 fighting knife, a World War II American issue knife
 * M3 machine gun, a variant of the M2 Browning
 * M3 submachine gun (AKA: Grease Gun), an American submachine gun
 * M3 tripod, a modern tripod for the M2 Browning machine gun
 * M3, a code name for a United States military mission at Roosevelt Roads Naval Station in Puerto Rico

Vehicles

 * M3 Amphibious Rig, a German self-propelled amphibious bridging vehicle
 * M3 Bradley, an American infantry fighting vehicle
 * M3 Gun Motor Carriage, American tank destroyer
 * M3 half-track, an armored military vehicle
 * M3 Lee, an American medium tank; also known as "M3 Grant" in Commonwealth service
 * Panhard M3 PTT, a French armored personnel carrier
 * HMS Raglan (M3), a WWI British Royal Navy monitor
 * M3 Ram, a Canadian cruiser tank
 * M3 Scout Car, an American armored vehicle
 * M3 Stuart, an American light tank
 * HSWMS Visborg, a Swedish Royal Navy mine layer
 * HSWMS M3, a Swedish Navy mine sweeper (1940–1955)
 * HMS M3, a British Royal Navy minelayer submarine of the post-WWI period

Music

 * Major third (M3), a type of musical interval
 * Major thirds tuning (M3 tuning), a regular tuning with major-third intervals between successive strings
 * Minor third (m3), a type of musical interval
 * M3 (album), a 1999 album by Mushroomhead
 * M3 (band), an American rock band
 * M3 Classic Whitesnake, a band featuring Bernie Marsden, Micky Moody and Neil Murray
 * M3 Records, a record label
 * Korg M3, a workstation synthesizer

Science and medicine

 * m3, the cubic metre, a unit of volume
 * M3, the minimal modular, but non-distributive lattice in mathematical order theory
 * ATC code M03, Muscle relaxants, a subgroup of the Anatomical Therapeutic Chemical Classification System
 * Messier 3 (M3), a globular cluster in the constellation Canes Venatici
 * Muscarinic acetylcholine receptor M3, an acetylcholine receptor
 * The M-3 (My Mood Monitor) Screen, a mental health symptom checklist

Air transport

 * ABSA - Aerolinhas Brasileiras IATA airline designator M3, a cargo airline based in Campinas, Brazil
 * Miles M.3 Falcon, a 1930s British four-seat cabin monoplane

Automobiles

 * Bisu M3, a Chinese MPV
 * BMW M3, a German compact performance car series
 * BYD M3, a Chinese MPV
 * Dongfeng Fengxing Lingzhi M3, a Chinese MPV
 * Haima M3, a Chinese subcompact sedan
 * JAC Refine M3, a Chinese MPV

Roads and routes

 * Eastern Freeway (Melbourne), part of the M3 in Victoria, Australia
 * EastLink (Melbourne), part of the M3 in Victoria, Australia
 * Highway M03 (Ukraine), an international highway connecting Kiev with Dovzhansky
 * M3 highway (Russia), another name for the Ukraine Highway in Russia
 * M-3 (Michigan highway), a state highway in the Detroit metropolitan area
 * M3 motorway (disambiguation), several roads
 * M3 (New York City bus), a New York City Bus route in Manhattan
 * M3 Milton–City Centre, a bus route in Glasgow
 * M3 (East London), a Metropolitan Route in East London, South Africa
 * M3 (Cape Town), a Metropolitan Route in Cape Town, South Africa
 * M3 (Pretoria), a Metropolitan Route in Pretoria, South Africa
 * M3 (Port Elizabeth), a Metropolitan Route in Port Elizabeth, South Africa
 * Route M-3 (MTA Maryland), a former bus route in Baltimore, Maryland
 * Jalan Datuk Wira Poh Ah Tiam, numbered M3 in Malacca, Malaysia
 * M3 Road (Zambia), road in Zambia

Rail transport

 * LCDR M3 class, a steam locomotive class of the London, Chatham & Dover Railway
 * M1/M3 (railcar), a Long Island Rail Road and Metro-North Railroad railcar
 * Sri Lanka Railways M3, a diesel-electric locomotive class of Sri Lanka Railways
 * Line M3 (Budapest Metro), the North-South Line of the Budapest Metro, Hungary
 * M3 (Copenhagen) (City Circle Line or Cityringen), a future expansion of the Copenhagen Metro
 * M3 (Istanbul Metro), a rapid transit line in the European part of Istanbul, Turkey
 * Milan Metro Line 3, a subway line serving Milan, Italy

Other uses

 * M3, an ISO metric screw thread size
 * M3 (economics), a measure of the money supply
 * M3 (hieroglyph), the Ancient Egyptian baker's tool hieroglyph
 * MLBB M3 World Championship, the third esports world championship for the mobile game Mobile Legends: Bang Bang held in 2021
 * M3, a difficulty grade in mixed climbing