1990–91 Campionato Sammarinese di Calcio

The 1990–91 Campionato Sammarinese di Calcio season was the 6th season since its establishment. It was contested by 10 teams, and S.C. Faetano won the championship.

First round

 * S.C. Faetano 3-0 S.S. Folgore/Falciano
 * S.S. Juvenes 4-2 S.S. Montevito

Second round

 * S.S. Folgore/Falciano 0-1 S.S. Montevito
 * S.C. Faetano 2-1 S.S. Juvenes

Third round

 * S.S. Juvenes 2-1 S.S. Montevito
 * S.P. Tre Fiori 4-1 S.C. Faetano

Semifinal

 * S.C. Faetano 3-1 S.S. Juvenes

Final

 * S.C. Faetano 1-0 S.P. Tre Fiori