Adelino Manuel Lopes Amaro da Costa, GCIH (18 April 1943 – 4 December 1980) was a Portuguese politician.

After the Carnation Revolution, he founded, together with Diogo Freitas do Amaral, the Democratic and Social Centre (CDS), in which he became Deputy to the Assembly of the Republic and Minister.

He died in the 1980 Camarate air crash, together with his wife Maria Manuel Simões Vaz da Silva Pires, the prime minister Francisco de Sá Carneiro and Sá Carneiro's partner, Snu Abecassis, while heading to Porto to take part in a rally for the 1980 Portuguese presidential election.

Claims have been made he was the true target for assassination, for he had documents concerning the 1980 October Surprise theory and was planning on taking them to the United Nations's General Assembly.

These affirmations are reinforced with the fact that Amaro da Costa was the one renting the plane, and Sá Carneiro a last minute passenger (possibly as a decoy).