Mariana Victoria of Spain (d. 1781)

Mariana Victoria of Spain (Portuguese: Mariana Vitória; 31 March 1718 – 15 January 1781) was an Infanta of Spain by birth and was later the Queen of Portugal as wife of King Joseph I. She acted as regent of Portugal in 1776-1777, during the last months of her husband's life and as advisor to her daughter, Maria I of Portugal, in her reign.