The Anta da Pedra dos Mouros (Stone of the Moors), also known as the Anta do Senhor da Serra (Lord of the Mountains), is a megalithic dolmen situated near Belas and Queluz in the Lisbon District of Portugal. It is believed to date back to the late-Neolithic and early-Chalcolithic eras (4000-2500 BC). The Anta da Pedra dos Mouros, the Anta da Estria, and the Anta do Monte Abraão are a short distance from each other and are collectively known as the Antas de Belas. The Anta da Pedra dos Mouros was first identified in the 1850s by Carlos Ribeiro. Despite being registered and protected as a national monument in 1910, the dolmen has recently suffered significant damage.