Alou Diarra (French pronunciation: [alu djaʁa]; born 15 July 1981 in Villepinte) is a French international footballer who currently plays for French club Marseille in Ligue 1. He primarily plays as a defensive midfielder, but can also deputized as a centre back if necessary. Diarra is described as a player who is "strong, athletic and very powerful" and possesses a "combative edge" similar to former French international Patrick Vieira. Diarra is also known for his leadership ability and has served as captain of both Bordeaux domestically and France internationally.

Diarra began his career playing for clubs based in Seine-Saint-Denis, such as CSL Aulnay and hometown club FC Villepinte. In 1997, he joined Louhans-Cuiseaux and made his professional debut with the club in the 1999–2000 season while the club was playing in the second division. In 2000, Diarra was recruited by German club Bayern Munich. He spent two years playing on the club's reserve team, Bayern Munich II. In 2002, he was signed by compatriot Gérard Houllier as part of the manager's French Revolution to play for English club Liverpool. Diarra's stint at the club was deemed a disappointment as he spent both years at the club on loan in France playing for Le Havre, Bastia, and Lens.