William Henry Fitzroy, 6th Duke of Grafton (5 August 1819 – 21 May 1882), styled Viscount Ipswich until 1847 and Earl of Euston between 1847 and 1863, was a British peer and Liberal Party politician.

He was the son of Henry FitzRoy, 5th Duke of Grafton and his wife Mary Caroline Berkeley, who were married on 20 June 1812 in Lisbon.

[citation needed] In 1860 he was appointed lieutenant-colonel in command of the 1st Administrative Battalion of Northamptonshire Rifle Volunteers.

[4] He died childless in 1882, aged 62, in London and was succeeded as Duke of Grafton by his younger brother, Augustus.

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