Francisco de Paula de Borbón y Castellví (Spanish: Don Francisco de Paula Maria Trinidad Enrique Gabriel Miguel Rafael Edmundo Buenaventura de Borbón y Castellví; 29 March 1853 – 28 March 1942) was a younger son of the controversial Infante Enrique, Duke of Seville, grandson of Charles IV of Spain and younger brother of Francis, Duke of Cádiz, King consort of Isabella II of Spain.
Despite his family ties, Francisco was never entitled Infante of Spain due to the unequal marriage of his parents, which did not receive approval from Queen Isabella II.