Charles Wentworth-Fitzwilliam, 5th Earl Fitzwilliam KG (4 May 1786 – 4 October 1857) was a British nobleman. He was three times President of the Royal Statistical Society (1838–40, 1847–49 and 1853–5).
Before inheriting the Earldom, he was known by the courtesy title of Viscount Milton. Under that name he was the Whig Member of Parliament from Northamptonshire between 1831 and 1832.