M4

M4 or M-4 most often refers to:

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

HSwMS Carlskrona (M04), a 1980 Swedish Navy minelayer, later redesignated as ocean patrol vessel P04
HSwMS M4, a Swedish Navy mine sweeper
HMS Roberts (1915) (M4), a WWI British Royal Navy monitor
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

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

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

Héctor David Delgado Santiago (1975–2013, alias El Metro 4, sometimes M4), deceased 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