Santo Tomas, officially the Municipality of Santo Tomas, (Tagalog: Bayan ng Santo Tomas), is a 1st class municipality in the province of Batangas, Philippines. According to the 2015 census, it has a population of 179,844 people.

With the continuous expansion of Metro Manila, the municipality is now part of Manila's conurbation which reaches Lipa City in its southernmost part. It borders the cities of Calamba City to the north, Los Baños to the north-east, Alaminos to the east, Tanauan City and Malvar to the west, and Lipa City to the south.

Santo Tomas is the hometown of Philippine Revolution and Philippine-American War hero Miguel Malvar, the last Filipino General to surrender to the Americans.

The patron of Santo Tomas is Saint Thomas Aquinas, patron of Catholic schools, whose feast day is celebrated every 7 March.