Fronteira () is a municipality in Portalegre District in Portugal. The population in 2011 was 3,410,Instituto Nacional de Estatística in an area of 248.60 km2.
The present Mayor is Rogério David Sádio da Silva, elected by the Social Democratic Party. The municipal holiday is April 6.
Parishes Administratively, the municipality is divided into 3 civil parishes (freguesias): Cabeço de Vide Fronteira São Saturnino
Notable people Manuel Cardoso (1566–1650) a Portuguese composer and organist. Bartolomeo Riberi (1640–1702) a Roman Catholic prelate, Bishop of Nicotera, 1691–1702
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