M84 or M-84 may refer to:
M-84, a Yugoslav main battle tank M-84 (Michigan highway), a north–south state trunkline highway in the Lower Peninsula M-84, a route of the United States Marine Highway Program M84 camouflage pattern, the former camouflage pattern of the Danish military M84 mortar carrier, a derivative of the American M59 armored personnel carrier M84 stun grenade, a flashbang used by the United States Messier 84, a giant elliptical or lenticular galaxy in the constellation Virgo Nora M-84, a Yugoslav and Serbian 152 mm and 155 mm gun-howitzer Zastava M84, a general-purpose machine gun
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