William Thomas Spencer Wentworth-FitzWilliam, 6th Earl FitzWilliam, styled Hon. William Wentworth-Fitzwilliam 1815–1835, and Viscount Milton 1835–1857, was a British peer, nobleman, and Liberal Party politician. One of England's richest man when he died, he left a colossal sum of £3 billion making his fortune from Yorkshire coal.
- Occupation
- politician, cricketer
- Position held
- member of the 17th Parliament of the United Kingdom, member of the 16th Parliament of the United Kingdom, member of the 15th Parliament of the United Kingdom, member of the 14th Parliament of the United Kingdom
- Citizenship
- United Kingdom of Great Britain and Ireland
