Fitzwilliam (or FitzWilliam) may refer to:
Persons:
- Richard FitzWilliam, 5th Viscount FitzWilliam (1677–1743), Irish nobleman and politician
- Wendy Fitzwilliam (b.1972), Trinidad and Tobago's second Miss Universe
- William FitzWilliam, 4th Earl FitzWilliam (1748–1833), British statesman
- Richard FitzWilliam, 7th Viscount FitzWilliam (1745–1816)
- Thomas Fitzwilliam (disambiguation)
Peerages:
- Earl FitzWilliam, title in the Peerage of Ireland and the Peerage of Great Britain
- Viscount FitzWilliam, title in the Peerage of Ireland
Place names:
- Fitzwilliam, West Yorkshire, village in England
- Fitzwilliam, New Hampshire, town in USA
Other:
- Fitzwilliam College, Cambridge (University of Cambridge)
- Fitzwilliam Museum, art and antiquities museum of the University of Cambridge
- Fitzwilliam Darcy, a fictional character from Jane Austen's Pride and Prejudice
- Fitzwilliam Virginal Book, source of keyboard music in the Elizabethan and Jacobean periods in England