|Look up MP4 in Wiktionary, the free dictionary.|
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 video game for Nintendo GameCube
- 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: Days Since a Lost Time Accident, the fourth album by Michael Penn
- MP4 player, a marketing name for certain portable media players
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