Charles Lennox, 1st Duke of Richmond and 1st Duke of Lennox (29 July 1672 - 27 May 1723), was the illegitimate son of Charles II of England and his mistress Louise de Keroualle, Duchess of Portsmouth.

Lennox was created Duke of Richmond, Earl of March and Baron Settrington in the Peerage of England on 9 August 1675 and Duke of Lennox, Earl of Darnley and Lord Torbolton in the Peerage of Scotland on 9 September 1675, and was invested as a Knight of the Garter in 1681. Married to Anne Brudenell, he had three children:

• Lady Louisa Lennox, later Countess of Berkeley
• Charles Lennox, Earl of March, later 2nd Duke of Richmond and 2nd Duke of Lennox
• Lady Anne Lennox, later Countess of Albemarle