Charles FitzRoy, 2nd Duke of Grafton, KG, PC, FRS (25 October 1683 – 6 May 1757) was a British peer and politician.

He was the only child and heir of Henry FitzRoy, 1st Duke of Grafton (1663–1690) (an illegitimate son of King Charles II by his mistress Barbara Villiers) by his wife Isabella Bennet, 2nd Countess of Arlington, a great-granddaughter of William the Silent.

[1] He served as Lord High Steward at King George I's coronation, becoming a Privy Counsellor in 1715 and a Knight of the Garter in 1721.

In 1719 he was one of the main subscribers to the Royal Academy of Music, a corporation that produced baroque opera on the stage.

For a number of years he and Princess Emily, one of George II's daughters, enjoyed a semi-flirtatious relationship.