MM3 may refer to: MM3 (force field), a class of force fields in chemistry mm3, a cubic millimetre or microlitre Mm3, a cubic megametre or zettalitre, Litre#SI prefixes applied to the litre Mega Man 3, a 1990 video game for the NES Might and Magic III: Isles of Terra, a 1991 video game for the PC and many other platforms Mega Man III (Game Boy), a 1992 video game for the Game Boy Midtown Madness 3, a 2003 video game for the Xbox The Minuteman III intercontinental ballistic missile. MM3 register, a CPU register used by the MMX extension