William Wentworth-Fitzwilliam, 6th Earl Fitzwilliam

William Thomas Spencer Wentworth-FitzWilliam, 6th Earl FitzWilliam, KG (12 October 1815 – 20 February 1902), styled Hon. William Wentworth-Fitzwilliam 1815–1835, and Viscount Milton 1835–1857, was a British peer, nobleman, and Liberal Party politician.

Wentworth-Fitzwilliam was the second son of Charles Wentworth-FitzWilliam, 5th Earl FitzWilliam and his wife, Hon. Mary Dundas. He was educated at Eton and Trinity College, Cambridge, where he graduated MA in 1837. Two years earlier, his elder brother had died without issue, and he became heir to his father´s estates and took the courtesy title Viscount Milton. He became Member of Parliament for Malton in 1837. Holding the seat until 1841, he later reclaimed it in 1846 and then sat for Wicklow from 1847 until 1857, the year he inherited his father's earldom.

He was a JP for the county of the West Riding, DL and a County Councillor for County Wicklow in Ireland.

He held the command of the First West Yorkshire Yeomanry Cavalry for 40 years, from 1846–1886, and was a Yeomanry Aide-de-camp to Queen Victoria's Viceroy in India, 1884–1894. Promoted Major for the 3rd battalion Oxs and Bucks LI, he also hedl an number of other military posts. In the territorial army he was Lt-Colonel of West Riding RHA with the temporary rank in the British Army during wartime. During the Boer War he was a Captain on the HQ Staff, and was transferred to the staff during the Great War.

In 1857, Lord FitzWilliam was appointed Lord Lieutenant of the West Riding of Yorkshire, and stayed as such until 1892. He was appointed a Knight of the Garter in 1862, and was the senior knight at the time of his death. He died at his residence Wentworth Woodhouse, in Rotherham, 20 February 1902. As his eldest son predeceased him, his titles passed to his grandson, William.

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