Henry FitzRoy, 1st Duke of Grafton

His Grace The Duke of Grafton KG
Vice-Admiral of England
In office 1682–1689
Preceded by	The Duke of Cumberland
Succeeded by	The Earl of Torrington
Personal details
Born	Henry FitzRoy (1663-09-28)28 September 1663
Died	9 October 1690(1690-10-09) (aged 27) Cork, Ireland
Spouse	Isabella Bennet, 2nd Countess of Arlington ​ ​ (m. 1672)​
Children	Charles FitzRoy, 2nd Duke of Grafton
Parent(s)	Charles II of England Barbara Villiers, 1st Duchess of Cleveland

Henry FitzRoy, 1st Duke of Grafton (28 September 1663 – 9 October 1690) was an illegitimate son of King Charles II of England and his mistress Barbara Villiers. A military commander, Henry FitzRoy was appointed colonel of the Grenadier Guards in 1681 and Vice-Admiral of England from 1682 to 1689. He was killed in the storming of Cork during the Williamite–Jacobite War in 1690.