José Bernardino de Portugal e Castro (20 May 1780 - 26 February 1840) was a Portuguese marquis and the President of the Council of Ministers from 4 to 5 November 1836. He was the 5th Marquis of Valença.
He was distant relative of reigning family, being male line descendant of 1st Duke of Braganza. His father was Dom Afonso Miguel de Portugal e Castro (1748–1802), 4th Marques de Valença, 11th Conde de Vimioso, governor of Bahia and great-great-great-great-great-grandson of Dom Francisco de Portugal e Castro (1480–1549), 1st Conde de Vimisio. The latter was legitimized son of Dom Afonso de Bragança (1440–1522), Bishop of Évora, who was in the turn an illegitimate son of Dom Afonso of Braganza, 1st Marquis of Valença. The Marquis was the eldest son of the 1st Duke of Braganza.
His mother was Maria Teles da Silva (1758–1804), daughter of Manuel Teles da Silva (1727–1789), 6th Conde de Vilar Maior, and his 2nd wife Eugénia de Menezes da Silva (1731–1788), 2nd Marquesa de Penalva & 6th Condessa de Tarouca.