San Martino del Lago (Cremunés: ) is a comune (municipality) in the Province of Cremona in the Italian region Lombardy, located about southeast of Milan and about southeast of Cremona.
San Martino del Lago borders the following municipalities: Ca' d'Andrea, Cingia de' Botti, Scandolara Ravara, Solarolo Rainerio, Voltido. The municipal seat is in the frazione of CÃÂ de' Soresini.