'''M18''' may refer to:
[[File:Hawk Engineering Company MM-1M18 smoke grenade.jpg|thumb|right|Hawk Engineering MM-1M18 grenade]][[File:Arms Tech MM-1 MinimoreM18A1 Claymore.jpg|thumb|right|MM-1 MinimoreM18A1 Claymore]]
* The [[M18 grenade|M18]], a smoke grenade