Charles Wentworth-Fitzwilliam, 5th Earl Fitzwilliam
Charles William Wentworth Fitzwilliam, 3rd Earl Fitzwilliam in the peerage of England, and 5th Earl Fitzwilliam in the peerage of Ireland KG (4 May 1786 – 4 October 1857) was a British nobleman. He was President three times of the Royal Statistical Society in 1838–40, 1847–49, and 1853–5; and President of the British Association for the Advancement of Science in its inaugural year (1831–2).
Before inheriting the Earldom on 8 February 1833 on the death of his father, he was known by the courtesy title of Viscount Milton. Under that name he was the Whig Member of Parliament for Northamptonshire between 1831 and 1832.
He married the Hon. Mary Dundas (30 May 1787 – 1 November 1830) on 8 July 1806; she was his cousin and the daughter of Thomas Dundas, 1st Baron Dundas and Lady Charlotte Fitzwilliam, the 2nd and 4th Earl's sister. He was succeeded by his second son William.
- Stephen, Leslie, ed. (1889). "Fitzwilliam, Charles William Wentworth". Dictionary of National Biography 19. London: Smith, Elder & Co.
- Hansard 1803–2005: contributions in Parliament by Viscount Milton
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