The 2004–05 season is River Plate's 75nd season in the Argentine Primera División.
The season was split into two tournaments (format adopted since 1990–91 season) Apertura (Opening) 2004 (from August to December 2004), and Clausura (Closing) 2005 (from February to June 2005).
The club's kit was provided by Adidas, and the sponsor was Budweiser beer.