Mexican Migration Project, a Sociological Database at Princeton University

Mixed member proportional representation, a voting system

Matrix metalloproteinase enzymes

Main Manufacturing Process, TRIZ term.

Massively multiprocessing, a computer term used to distinguish symmetric multiprocessing (SMP) systems using tens of processors from those typically using 2-10 (roughly speaking)

Methuselah Mouse Prize, for research into slowing cellular aging

Manitoba Marijuana Party, a political party in Manitoba, Canada

Metal Mind Productions, Polish music label

The Minuteman Project, 2005 action to deter illegal immigration

International Organization of Masters, Mates & Pilots, maritime labor union

Multi-Man Publishing, a wargame company in Millersville, Maryland

Massively Multi-Player, a type of online game of which MMORPGs are an example

Moldova Metallurgical Plant, part of Metalloinvest in Russia.

Makmake Project File, a computer file used to define a Symbian C++ project.

Miss Moneypenny, the James Bond's secretary

Mew Mew Power, the North American adaptation of the Japanese anime series Tokyo Mew Mew

Millennium Mathematics Project, a project devoted to mathematics set up by the University of Cambridge.