Benedict Swingate Calvert (January 27, 1722 – January 9, 1788) was a planter, politician and a Loyalist in Maryland during the American Revolution. He was the son of Charles Calvert, 5th Baron Baltimore, the third Proprietor Governor of Maryland (1699–1751), and may have been the grandson of King George I of Great Britain. His mother's identity is not known, though one source suggests Melusina von der Schulenburg, Countess of Walsingham.