Richard Savage Nassau (1 June 1723 – 17 May 1780) was an English Member of Parliament who served from 1747 to 1780, with a 20-year gap between 1754 and 1774.
He supported the government of Henry Pelham and the Duke of Newcastle and did not seek re-election at the next general election in 1754.
They had two sons and one daughter: The elder son William Henry had been intended by his uncle and namesake William Henry Nassau, 4th Earl of Rochford to enter the House of Commons for Maldon when he came of age in 1775.
Richard Nassau refused to stand as he was still recovering from the death of his second wife on 18 October, so Charles Rainsford was returned instead.
As well as sitting in Parliament, Nassau was a Groom of the Bedchamber from January to October 1760, and Clerk of the Board of Green Cloth from 1771 to his death.