MP4 is MPEG-4 Part 14, a file format.

Look up MP4 in Wiktionary, the free dictionary.

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

• MP4 player, a marketing name for certain portable media players

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