Maria Anne Fitzherbert (previously Weld, née Smythe; 26 July 1756 – 27 March 1837) was a longtime companion of the future King George IV of the United Kingdom with whom she secretly contracted a marriage that was invalid under English civil law before his accession to the throne. Though Fitzherbert had been disinherited by her first husband, her nephew (Cardinal Weld) persuaded Pope Pius VII to declare the marriage sacramentally valid.