Count of Assumar was a Portuguese title of nobility granted, on 30 March 1630, by King Philip III of Portugal, to D. Francisco de Melo, son of Constantino de Bragança, a junior member of the House of Cadaval.
As Francisco de Melo supported the right of the Habsburgs to the Portuguese throne, even after their expulsion on 1 December 1640, the county returned to the Crown, and it was granted, again, by Prince Regent Pedro (who later became Peter II of Portugal) to D. Pedro de Almeida, on 11 April 1677.