501 (disambiguation)

501 is a year in the Common Era.

501 may also refer to:


 * 501 BC, a year in the era B.C.
 * 501 (number)

Military

 * Avro 501, a military seaplane
 * 501 Squadron (disambiguation), several units
 * 501 Organization, a fictional unit from a Japanese anime series Ghost in the Shell: Arise

Transportation

 * List of highways numbered 501
 * Flight 501 (disambiguation), several flights
 * 501 Queen, a streetcar route in Toronto
 * Allison 501, an aircraft turboprop engine
 * BMW 501, a luxury car produced by BMW
 * British Rail Class 501, an electric multiple unit train type
 * Fiat 501, a small family car produced by Fiat

Other uses

 * 501, the name of a game of darts
 * Section 501, a provision of the Australian Migration Act 1958
 * The record score in first-class cricket by Brian Lara, and also Lara's brand of clothing in honour of this event
 * a type of Levi's jeans
 * an HTTP status code meaning Not implemented
 * SMTP Error - 501, an SMTP status code meaning Syntax error in parameters or arguments
 * 501(c), a type of tax exemption for non-profit organizations in the United States
 * Area code 501, covering part of Arkansas, U.S.
 * Year 501: The Conquest Continues, by a book by Noam Chomsky
 * 501 Urhixidur, an asteroid
 * SARS-CoV-2 Beta variant, variant of COVID-19 also known as 501.V2 or 501Y.V2