The Anta do Monte Abraão was a megalithic dolmen located in the parish of Monte Abraão, in Queluz, Sintra Municipality, Lisbon District, Portugal. The dolmen was first identified in 1876, by Carlos Ribeiro, who carried out excavations until 1878 and published his results in 1880. Excavations suggest that it served as a tomb for about 80 individuals and that it dates back to the middle to end of the Neolithic period (4000-2500 BC). The Anta do Monte Abraão and the nearby Anta da Pedra dos Mouros (also known as the Anta do Senhor da Serra) and Anta da Estria are collectively known as the Antas de Belas.