São Martinho do Porto is a freguesia in Alcobaça Municipality and in the Oeste region of Portugal. The population in 2011 was 2,868, in an area of 14.64 km2. It was a town and county seat until 1855.

Alcobaça is a Portuguese city and municipality in the Oeste region, in the historical province of Estremadura, and in the Leiria District. The city grew along the valleys of the rivers Alcoa and Baça, from which it derives its name. The municipality population in 2011 was 56,693, in an area of 408.14 square kilometres (157.58 sq mi). The city proper has a population of 15,800 inhabitants.