Charles William Wentworth Fitzwilliam, 3rd Earl Fitzwilliam in the peerage of Great Britain, and 5th Earl Fitzwilliam in the peerage of IrelandKG (4 May 1786 – 4 October 1857) was a British nobleman and politician. He was President three times of the Royal Statistical Society in 1838–1840, 1847–1849, and 1853–1855; 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 4th Earl's sister. They had 7 children:
Lady Frances Laura Wentworth-FitzWilliam (d. 25 August 1887). Married on 23 June 1837 to Reverend William Bridgman-Simpson. They had 5 children:
Mary Bridgeman-Simpson (d. 18 January 1880)
Beatrice Dorothy Mary Bridgeman-Simpson (d. 8 July 1936)
Orlando John George Bridgeman-Simpson (27 August 1838 – 5 July 1907)
George Arthur Bridgeman-Simpson (14 November 1846 – 16 November 1913)
Lady Albreda Elizabeth Wentworth-Fitzwilliam (d. 11 November 1891). Married on 21 June 1853 to Fitzpatrick Henry Vernon, 2nd Baron Lyveden of Lyveden.
Lady Anne Wentworth-Fitzwilliam (14 May 1819 – 29 April 1879). Married on 10 October 1838, in the Chapel at Wentworth Woodhouse, to Sir James John Randoll Mackenzie of Scatwell, 6th Bt.
George Charles Wentworth-Fitzwilliam (2 January 1866 – 8 December 1935) Married on 31 December 1888 to Daisy Evelyn Lyster, daughter of Charles Stephan Lyster. They had 2 sons:
George James Charles Wentworth-FitzWilliam (May 1888 – 1955). Married in 1914 to Lorna Beryl Morgan. They had 2 children:
Richard John Godric Wentworth-Fitzwilliam (3 Feb 1916 – Oct 1987)
Rosemary Ann Wentworth-FitzWilliam (24 April 1918 – March 1997)
Alice Mary Wentworth-Fitzwilliam (18 October 1869 – 3 March 1956)
Maud Wentworth-Fitzwilliam (27 February 1871 – 15 July 1949)
Hon. Charles William Wentworth-Fitzwilliam (18 September 1826 – 20 December 1894). Married on 24 August 1854 to Anne Dundas, daughter of Reverend Hon. Thomas Lawrence Dundas. Died without issue.