 Darcy married four times; firstly to Lady Catherine Fane, daughter of Francis Fane, 1st Earl of Westmorland.His second marriage took place on 8 February 1650 to Lady Frances Howard (c. 1627–1670), daughter of Thomas Howard, 1st Earl of Berkshire.He married thirdly, in 1676, Lady Frances Seymour, daughter of William Seymour, 2nd Duke of Somerset.