M3
M3, M-3 or M03 may refer to:

Computing and electronics
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

Military
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 (M03), 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

Transport
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

See also

All pages with titles beginning with M3
All pages with titles containing M3
All pages with titles containing m-3
MMM (disambiguation)
3M (disambiguation)
M1903 (disambiguation)
MThree (Coquitlam), a high-rise condominium in British Columbia
List of highways numbered 3