2004–05 RC Lens season

The 2004–05 season was the 99th season in the existence of RC Lens and the club's 14th consecutive season in the top flight of French football. In addition to the domestic league, Lens participated in this season's edition of the Coupe de France and the Coupe de la Ligue. The season covered the period from 1 July 2004 to 30 June 2005.