Oleiros (European Portuguese pronunciation: [ɔˈlɐjɾuʃ] ) is a municipality in the district of Castelo Branco in Portugal. The population in 2011 was 5,721, in an area of 471.09 km. 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.

Oleiros has a total population of 5,271 in 2011.

Population of Oleiros Year Pop. ±% 1890 10,476 —     1900 11,203 +6.9% 1911 12,060 +7.6% 1920 11,977 −0.7% 1930 11,891 −0.7% 1940 14,020 +17.9% 1950 15,137 +8.0% 1960 15,553 +2.7% 1970 13,110 −15.7% 1981 10,183 −22.3% 1991 7,767 −23.7% 2001 6,677 −14.0% 2011 5,721 −14.3%

Administratively, the municipality is divided into 10 civil parishes (freguesias):

• Father António de Andrade (1580 – 1634) a Jesuit priest and explorer; a missionary in India, 1600–1634; the first known European to cross the Himalayas and reach Tibet.

• Vestas receives another order for V90-3.0 MW wind turbines in Portugal