House of Fitzwilliam
Barons Fitzwilliam, in the Peerage of Ireland (1620-1979)
Earls Fitzwilliam of the County of Tyrone, in the Peerage of Ireland (1716-1979)
Earls Fitzwilliam of Norborough, in the Peerage of Great Britain (1746-1979)
- William Fitzwilliam, 1st Baron Fitzwilliam (d.1644)
- William Fitzwilliam, 2nd Baron Fitzwilliam (c.1609–1658)
- William Fitzwilliam, 1st Earl Fitzwilliam, Viscount Miltown, 3rd Baron Fitzwilliam (1643–1719)
- William Fitzwilliam, 1st Earl Fitzwilliam (1643–1719)
- John Fitzwilliam, 2nd Earl Fitzwilliam (1681–1728)
- William Fitzwilliam, 3rd Earl Fitzwilliam and 1st Earl Fitzwilliam, Viscount Milton in the Peerage of Great Britain (1719–1756), married Lady Anne Watson-Wentworth (d. 1769), daughter of Thomas Watson-Wentworth, 1st Marquess of Rockingham
- William Fitzwilliam, 4th and 2nd Earl Fitzwilliam (1748–1833) 3rd Earl Fitzwilliam KG (1786–1857), In 1856 Lord Fitzwilliam assumed by Royal license the additional surname of Wentworth.
- William Thomas Spencer Wentworth-Fitzwilliam, 6th and 4th Earl Fitzwilliam KG (1815–1902)
- William Charles de Meuron Wentworth-Fitzwilliam, 7th and 5th Earl Fitzwilliam (1872–1943)
- (William Henry Lawrence) Peter Wentworth-Fitzwilliam, 8 th and 6th Earl Fitzwilliam (1910–1948)
- Eric Spencer Wentworth-Fitzwilliam, 9th and 7th Earl Fitzwilliam (1883-1952)
- William Thomas George Wentworth-Fitzwilliam, 10th and 7th Earl Fitzwilliam (1904–1979)
Barons Fitzwilliam
1st to 4th Earls Fitzwilliam
5th to 10th Earls Fitzwilliam