San Martín de Hidalgo Municipality is a municipality located in the Región Valles of the state of Jalisco, Mexico. As of 2010, the population was 26,306. The municipal seat is San Martín de Hidalgo. Other administrative communities include 5 delegations and 18 agencies.

San Martín de Hidalgo, formerly San Martín de la Cal, is the largest town and municipal seat of San Martín de Hidalgo Municipality, in Jalisco in central-western Mexico. As of 2015, the town had a population of 7,819. It is located 16 km southeast of the city of Ameca and 13 km northwest of the city of Cocula.