William FitzWilliam

William FitzWilliam (or William Fitzwilliam) may refer to:

• William Fitzwilliam (Sheriff of London) (1460?–1534), Protege of Cardinal Wolsey
• William FitzWilliam, 1st Earl of Southampton (c. 1490–1542), English courtier
• William FitzWilliam (Lord Deputy) (1526–1599), Lord Deputy of Ireland
• William FitzWilliam, 2nd Baron FitzWilliam (1609–1658), English politician
• William Fitzwilliam, 3rd Earl Fitzwilliam (1719–1756), British peer
• William Fitzwilliam, 4th Earl Fitzwilliam (1748–1833), British Whig statesman
• William Wentworth-Fitzwilliam, 6th Earl Fitzwilliam (1815–1902), British peer and Liberal politician
• William Fitzwilliam, Viscount Milton (d. 1835), British Member of Parliament for Malton

See also

• Earl Fitzwilliam, many who were named William FitzWilliam