Campo Maior (Portuguese pronunciation: [ˈkɐ̃pu mɐˈjɔɾ] (listen)) is a municipality in the Portalegre District, Alentejo Region, Portugal. The population in 2011 was 8,456, in an area of 247.20 square kilometres (95.44 sq mi). It is bordered by Spain on the North and East, by Elvas Municipality on the Southeast, and by Arronches Municipality on the West.