MP4 is MPEG-4 Part 14, a file format. MP4 may also refer to: Møller–Plesset perturbation theory of the fourth order in computational chemistry Mario Party 4, a 2002 video game for GameCube Metroid Prime 4, an upcoming video game for Nintendo Switch MP4 (band), a band made up of UK Members of Parliament Mammal Paleogene zone 4, a division of the Paleogene period McLaren MP4/1, the McLaren team's Formula One car MP4, a 2000 album by Michael Penn See also MP4 player, a marketing name for certain portable media players