Sesimbra (Portuguese pronunciation: [sɨˈzĩbɾɐ]) is a municipality of Portugal, in the Setúbal District, lying at the foothills of the Serra da Arrábida, a mountain range between Setúbal and Sesimbra.

Due to its particular position at the Setúbal Bay, near the mouth of the Sado River and its natural harbour, it’s an important fishing town, with a total area of 195.0 km² (75 sq mi) and a total population of 37,567 inhabitants.

The present Mayor is Augusto Pólvora.