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 (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)

• 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

• 400 series (disambiguation)