Doña Carlota Joaquina of Spain (Carlota Joaquina Teresa Cayetana; 25 April 1775 – 7 January 1830) was a Queen consort of Portugal as wife of John VI, Infant of Spain, Infant consort of Portugal, Princess consort of Brazil, Princess regent consort of Portugal and Queen consort of the United Kingdom of Portugal, Brazil and Algarves. She was the eldest daughter and surviving child of King Charles IV of Spain and his wife Maria Luisa of Parma.