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 (Gilded Age), the social elite of New York City in the late 19th century
  • 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
  • TV400, the former name of Swedish television channel Kanal 11 (Swedish TV channel)

Vehicles

  • Chevrolet 400, a compact car
  • Tank 400, a mid-size SUV
  • Ferrari 400, a grand tourer
  • Lloyd 400, a supermini car
  • Vespa 400, a microcar

See also

  • 400th (disambiguation)
  • 400 series (disambiguation)