M4
- 1N400x general purpose diode
- 4M (disambiguation)
- ATC code M04
- Apple M4
- BMW M4
- Benelli M4
- British NVC community M4
- Bucharest Metro Line M4
- Concrete Castles
- Covington Municipal Airport (Tennessee)
- Fifth and Madison Avenues Line
- Foton-M No.4
- Glossary of rowing terms
- Gross-Basenach
- Héctor David Delgado Santiago
- ISO metric screw thread
- Leica M4
- Line 4 (Budapest Metro)
- List of German gliders
- List of M4 roads
- List of mine warfare vessels of the Swedish Navy
- M05
- M2/M4/M6 (railcar)
- M4 (Copenhagen)
- M4 (EP)
- M4 (German Navy 4-rotor Enigma)
- M4 (Istanbul Metro)
- M4 (Warsaw)
- M4 (video game)
- M4 SLBM
- M4 Sherman
- M4 Survival Rifle
- M4 autocannon
- M4 bayonet
- M4 carbine
- M4 flame fuel thickening compound
- M4 tractor
- MIV (disambiguation)
- MLBB M4 World Championship
- Market–Frankford Line
- Maule M-4
- Messier 4
- Mid-engine, four-wheel-drive layout
- Milan Metro Line 4
- Miles M.4 Merlin
- Muscarinic acetylcholine receptor M4
- Myasishchev M-4
- Requiem for Methuselah
- Selectable Lightweight Attack Munition
- Sony Xperia M4 Aqua
- Spectre M4
- Sri Lanka Railways M4
- The Matrix Resurrections
- Vacamatic