Barreiro is a city and a municipality in the Setúbal District in Portugal. The population in 2021 was 78,345, in an area of 36.39 km2. Barreiro has a view of the city of Lisbon from Avenida da Praia and a riverside area called Alburrica. The mayor since 2017 has been Frederico Rosa, elected by the Socialist Party. The municipal holiday is June 28.