William FitzWilliam

• Earl Fitzwilliam
• Malton (UK Parliament constituency)
• William FitzWilliam (Lord Deputy)
• William FitzWilliam, 1st Earl of Southampton
• William FitzWilliam, 2nd Baron FitzWilliam
• William FitzWilliam, 3rd Viscount FitzWilliam
• William Fitzwilliam (Sheriff of London)
• William Fitzwilliam (died 1559)
• William Fitzwilliam, 1st Earl Fitzwilliam
• William Fitzwilliam, 3rd Earl Fitzwilliam
• William Fitzwilliam, 4th Earl Fitzwilliam
• William Fitzwilliam, Viscount Milton (d. 1835)
• William Wentworth-Fitzwilliam, 6th Earl Fitzwilliam
• William Wentworth-Fitzwilliam, 7th Earl Fitzwilliam