M84 or M-84 may refer to:
- Messier 84, a lenticular galaxy in the Virgo Cluster
- M-84, a Yugoslav main battle tank
- M84 machine gun, a Yugoslav copy of the PK machine gun
- M84 camouflage pattern, a camouflage pattern used by the Royal Danish Army
- M84 stun grenade, a non-lethal grenade
- 152 mm field gun-howitzer M84 NORA-A, a Yugoslav 152 mm field gun-howitzer
- M-84 (Michigan highway), a state highway in Michigan
- M84 Mortar Carrier, a derivative of the M59 Armored Personnel Carrier
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