Charles FitzRoy, 2nd Duke of Grafton (25 October 1683 - 6 May 1757) was an Irish and English politician.
His father, Henry FitzRoy, 1st Duke of Grafton, was the illegitimate son of King Charles II; Fitzroy inherited his father's peerages on 9 October 1690. He was Lord High Steward at King George I's coronation. He became a Privy Counsellor in 1715 and a Knight of the Garter in 1721. He also served as Lord Lieutenant of Ireland from 1720 to 1724.
He married Lady Henrietta Somerset; they had seven children.
