2004–05 Lille OSC season

The 2004–05 season was the 60th season in the existence of Lille OSC and the club's fifth consecutive season in the top flight of French football. In addition to the domestic league, Lille participated in this season's editions of the Coupe de France, Coupe de la Ligue, the UEFA Intertoto Cup and UEFA Cup. The season covered the period from 1 July 2004 to 30 June 2005.

Group stage
The group stage draw was held on 5 October 2004.