Haidari Football Club (Greek: Α.Ο. Χαϊδαρίου A.O. Haidariou) is a Greek football club, based in Haidari, Athens. It currently plays in the local Athens Football Clubs Association championships, the fifth level of Greek football. The club’s biggest achievement was participating in the Beta Ethniki for three consecutive seasons, 2005–06 through 2007–08, as well as reaching the Round of 16 in the 2006–07 Greek Cup following their win against AEK Athens F.C.
The club was founded in 1937 and their first club colors were red and black, it changed to blue and red 40 years later. Their first lower national division entry was in 1986 (Fourth Division) and the first time in the Third Division in 1990.