Oeiras may refer to:
Places Brazil Oeiras, Piauí, a municipality in the State of Piauí Oeiras do Pará, a municipality in the State of Pará
Portugal Oeiras, Portugal, a municipality in the district of Lisbon Oeiras e São Julião da Barra, a former civil parish in the municipality of Oeiras Oeiras e São Julião da Barra, Paço de Arcos e Caxias, successor of the above