The 2003–04 Campionato Sammarinese di Calcio season was the 19th season since its establishment. It was contested by 15 teams, and S.S. Pennarossa won the championship.

Regular season

Group A

Group B

Results All teams play twice against the teams within their own group and once against the teams from the other group.

Championship playoffs

First round

Second round

Third round

Fourth round

Semifinal

Final

References San Marino - List of final tables (RSSSF)