Dom João Carlos Gregório Domingos Vicente Francisco de Saldanha Oliveira e Daun, (1790 – 1876), 1st Count (1833), 1st Marquis (1834) and 1st Duke of Saldanha (1846), was a Portuguese marshal and statesman, a grandson of Pombal, born at Azinhaga. He studied at Coimbra, served against the French, and was made a prisoner in 1810. On his release he went to Brazil, where he was employed in the military and diplomatic services. He returned to Portugal after the declaration of the independence of Brazil.

The Duke of Saldanha, as he is commonly known, was one of the top dominating personalities in war and politics of Portugal, from the revolution of 1820 to his death in 1876. During that period he led no less than seven coups d'état. He played an important part in the struggle between brothers Pedro IV of Portugal (I of Brazil) and Miguel of Portugal during the Liberal Wars. He became Minister of Foreign Affairs in 1825 and was governor of Oporto in 1826 - 27.

He was made a Duke of Saldanha in 1846, and was Prime Minister for three times between 1846 and 1870. He was sent in 1871 to London as Ambassador, where he died.