The Four Hundred

The Four Hundred may refer to:

• The oligarchic government controlling Athens after the Athenian coup of 411 BC
• The social elite of New York City in the late 19th century; a term coined by Ward McAllister, supposedly the number of people Mrs William Backhouse Astor, Jr's ballroom could accommodate
• The Four Hundred (band), an indie rock band based out of Milwaukee, Wisconsin, United States
• The Game's Four Hundred, a slogan used by The Baseball Register, a play on New York's social elite
• The 400 (criminal organization), an international criminal cartel affiliated with the Cali Cartel
• A series of passenger train services offered by Chicago and North Western Railway beginning with the Twin Cities 400 (originally named The 400) in the Midwestern United States
• New York State Route 400, also known as the Aurora Expressway, a highway in Erie County, New York, United States
• Ontario Highway 400, a highway in Ontario, Canada