The 2003 season was Cienciano's season since its founding in 1901. The club participated in the 2003 Torneo Descentralizado and 2003 Copa Sudamericana. This season was one of the most successful seasons for Cienciano as they won the 2003 Copa Sudamericana, the first and only international title for a Peruvian club.
Copa Sudamericana 2003 qualifying