William FitzGerald, 2nd Duke of Leinster

His Grace The Duke of Leinster KP PC (Ire)
The Duke of Leinster, by Gilbert Stuart
Master of the Rolls in Ireland
In office 1788–1789
Preceded by	Richard Rigby
Succeeded by	The Earl of Glandore The Earl of Carysfort
Clerk of the Crown in Ireland
In office 1795–1797
Preceded by	Sir Lucius O'Brien
Succeeded by	Lord Glentworth
Member of the House of Lords Lord Temporal
In office 19 November 1773 – 20 October 1804 Hereditary Peerage
Preceded by	James FitzGerald, 1st Duke of Leinster
Succeeded by	Augustus FitzGerald, 3rd Duke of Leinster
Member of Parliament for Dublin City
In office 1767–1773
Member of Parliament for Kildare Borough
In office 1768–1769
Personal details
Born	12 March 1749 London, Great Britain
Died	20 October 1804 (1804-10-21) (aged 55) Carton, Ireland
Spouse	Emilia Olivia St George ​ ​ (m. 1775; died 1798)​
Children	Lady Mary Lockhart-Ross Lady Emily FitzGerald Lady Elizabeth Baker George FitzGerald, Marquess of Kildare Cecilia Foley, Baroness Foley Olivia Kinnaird, Baroness Kinnaird Augustus FitzGerald, 3rd Duke of Leinster Lord William FitzGerald Isabella Charlotte de Rohan-Chabot, Comtess de Jarnac
Parents	James FitzGerald, 1st Duke of Leinster Lady Emily Lennox
Military service
Allegiance	Kingdom of Ireland
Branch/service	Volunteers
Rank	Colonel
Unit	Dublin Volunteers

William Robert FitzGerald, 2nd Duke of Leinster, KP, PC (Ire) (12/13 March 1749 – 20 October 1804) was an Irish liberal politician and landowner. He was born in London.