M4 or M-4 most often refers to: * M4 carbine, an American carbine * M4 Sherman, an American World War II medium tank M4, M04, or M-4 may also refer to:

Arts and entertainment

* ''M4'' (EP), a 2006 EP by Faunts * ''M4'' (video game), a 1992 computer game developed for the Macintosh * ''M.IV'' ("Matrix IV"), the fictional Warner Brothers videogame project inside the 2021 film '' The Matrix Resurrections'' * Former name of band First to Eleven * M4, the robot assistant to the character Flint in the Star Trek episode Requiem for Methuselah

Military

Weapons

* Benelli M4 Super 90, an Italian semi-automatic,gas-operated shotgun * M4 autocannon, an American 37 mm automatic gun * M4 Selectable Lightweight Attack Munition (SLAM), an American land mine * M4 SLBM, a French submarine-launched ballistic missile from 1985 * M4 Survival Rifle, an American rifle in aircraft survival gear * Spectre M4, an Italian submachine gun * M4 bayonet, an American World War II bayonet used for the M1 Carbine * Gross-Basenach ''M IV'', a pre-WWI German military semi-rigid airship

Aircraft, ships, and vehicles

* , a 1980 Swedish Navy minelayer, later redesignated as ocean patrol vessel ''P04'' * , a Swedish Navy mine sweeper * (M4), a First World War British Royal Navy monitor * , a British M-class submarine * M4 tractor, a U.S. Army artillery tractor from 1943 * Myasishchev M-4, a 1950s Soviet strategic bomber aircraft * Meusel ''M-IV'', a German glider; see List of German gliders

Other uses in military

* M4 flame fuel thickening compound, a substance used in fire bombs and incendiary weapons * M4 (German Navy 4-rotor Enigma), a variant of the Enigma cryptography machine * M04, desert variant of M05, a camouflage pattern used by the Finnish Defence Forces

Science and technology

Biology, medicine and organic chemistry

* ATC code M04, ''Antigout preparations'', a subgroup of the Anatomical Therapeutic Chemical Classification System * British NVC community M4, a type of mire plant community in the British National Vegetation Classification system * M4, the FAB classification of acute myelomonocytic leukemia * Muscarinic acetylcholine receptor M₄, a protein

Computing and electronics

* Apple M4, a central processing unit in the Apple M series * m4 (computer language), a macro processing language * M4, part number for a 1N400x general purpose diode * Sony Xperia M4 Aqua, a mobile phone * ARM Cortex-M#Cortex-M4, a processor family

Other uses in science and technology

* Messier 4 (M4), a globular cluster in the Scorpius constellation of stars * Leica M4, a 1967 35 mm camera * M4, an ISO metric screw thread * Foton-M No.4, a Russian microgravity and bioscience research spacecraft launched in July 2014

Transportation

Air

* Covington Municipal Airport (Tennessee), FAA location identifier M04 * Maule M-4, a 1960 American four-seat cabin monoplane aircraft * Miles M.4 Merlin, a 1930s British five-seat cabin monoplane aircraft

Rail

* Bucharest Metro Line M4, Romania * Line 4 (Budapest Metro), Metro 4 or M4, Hungary * M4 (Copenhagen), a future expansion of the Copenhagen Metro, Denmark * M4 (Istanbul Metro), a subway line on the Asian side of Istanbul, Turkey * M4, variant of the M2, an American electric multiple unit on the Metro-North Railroad * M4, an American rapid transit car on the Market–Frankford Line * Milan Metro Line 4, rapid transit line in Milan, Italy * Sri Lanka Railways M4, a class of diesel-electric locomotive * M4 (Warsaw), proposed subway line in Warsaw, Poland

Road

* BMW M4, a car * M4 Vacamatic, a 1941 semi-automatic transmission made by Chrysler * M4, a bus route of Fifth and Madison Avenues Line, New York City, U.S. * Mid-engine, four-wheel-drive layout, or M4 layout, an automotive design * List of M4 roads

Other uses

* Héctor David Delgado Santiago (1975–2013, alias El Metro 4, sometimes M4), Mexican drug lord * M4, a measure of money supply * M4-, M4+ and M4x, disciplines in men's rowing * MLBB M4 World Championship, the fourth esports world championship for the mobile game Mobile Legends: Bang Bang held in 2023 * M4, a difficulty grade in mixed climbing