M4

• 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

• 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

• {{ship|HSwMS|Carlskrona|M04}}, a 1980 Swedish Navy minelayer, later redesignated as ocean patrol vessel P04
• {{ship|HSwMS|M4}}, a Swedish Navy mine sweeper
• {{ship|HMS|Roberts|1915}} (M4), a First World War British Royal Navy monitor
• {{ship|HMS|M4|1919}}, 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

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• MIV (disambiguation)
• 4M (disambiguation)

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