Henry FitzRoy, 5th Duke of Grafton (10 February 1790 – 26 March 1863), styled Viscount Ipswich until 1811 and Earl of Euston between 1811 and 1844, was a British peer and politician.
Grafton was the son of George FitzRoy, 4th Duke of Grafton and Lady Charlotte Maria Waldegrave, daughter of James Waldegrave, 2nd Earl Waldegrave.The 6th Duke was a politician.
He represented Bury St Edmunds as a Whig between 1818 and 1820 and again between 1826 and 1831, and was member for Thetford between 1834 and 1841.
On 24 May 1830, he was commissioned colonel of the West Suffolk Militia.
Grafton married Mary Caroline Berkeley (maternal great-granddaughter of Charles Lennox, 2nd Duke of Richmond), on 20 June 1812 in Portugal. They had five children:
Grafton died in 1863, aged seventy-three, at Wakefield Lodge, near Potterspury, Northamptonshire.