Oleiros (Portuguese pronunciation: [oˈlɐjɾuʃ]) is a municipality in the district of Castelo Branco in Portugal. The population in 2011 was 5,721, in an area of 471.09 km². The present mayor is José Santos Marques, elected by the Social Democratic Party. The municipal holiday is the Monday after the 2nd Sunday of August.
Built in 2006, a wind farm (Pinhal Interior Wind Farm) operates in Oleiros, comprising a 54 MW power generation capacity.
Administratively, the municipality is divided into 10 civil parishes (freguesias):
- Amieira - Oleiros
- Estreito - Vilar Barroco
- Sarnadas de São Simão