Santa Maria, officially the Municipality of Santa Maria, is a 3rd class municipality in the province of Ilocos Sur, Philippines. According to the 2020 census, it has a population of 30,006 people.

Ilocos Sur, officially the Province of Ilocos Sur, is a province in the Philippines located in the Ilocos Region in Luzon. Located on the mouth of the Mestizo River is the capital of Vigan. Ilocos Sur is bordered by Ilocos Norte and Abra to the north, Mountain Province to the east, La Union and Benguet to the south and the South China Sea to the west.