MP4 can refer to:

• MPEG-4 Part 14 file format
• MP4 player, a marketing name for certain portable media players, mainly used in the People's Republic of China.
• The McLaren team's Formula One cars, from the MP4 to the current MP4-23
• 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
• MP4 (rap group), a rap group from China
• MP4 (album), a 2000 album by Michael Penn

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