William Fitzwilliam

William Fitzwilliam is the name of the following people:

• William Fitzwilliam (merchant) (around 1460–1534), English merchant and civil servant
• William Fitzwilliam, 1st Earl of Southampton (around 1490–1542), English nobleman
• William Fitzwilliam (politician, 1526) (1526–1599), English politician, Lord Deputy of Ireland
• William Fitzwilliam (politician, around 1550) (around 1550–1618), English politician
• William Fitzwilliam, 1st Earl Fitzwilliam (1643–1719), English nobleman
• William Fitzwilliam, 4th Earl Fitzwilliam (1748–1833), British nobleman

This is a disambiguation page for differentiating between several terms identified with the same word.