2009–10 Campionato Sammarinese di Calcio

The 2009–10 Campionato Sammarinese di Calcio season was the twenty-fifth since its establishment.

The season began in September 2009 and ended with the playoff final in May 2010.

Tre Fiori were the defending league champions, having won their fifth Sammarinese championship the previous season.

The teams did not have grounds of their own due to restricted space in San Marino.

This meant that the clubs in the eight-club group played 21 matches each while the clubs in the seven-club group played 20 matches each during the regular season.