400 (disambiguation)
400 may refer to:
- 400 (number), the natural number following 399 and preceding 401
- A year: 400 BC or AD 400
- The Four Hundred, the oligarchic government controlling Athens after the Athenian coup of 411 BC
- The Four Hundred (1892), the social elite of New York City in the late 19th century
- The Four Hundred (band), an American indie rock band
- The Game's Four Hundred, the subtitle of the almanac, the Baseball Register
- List of highways numbered 400
- Twin Cities 400, a passenger train operated by Chicago & Northwestern Railway from 1935 to 1963
- 400 (card game), a Lebanese trick-taking game
- HTTP 400, the HTTP error code for "Bad Request"
- Ping Shan stop, Hong Kong; station code
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