William FitzWilliam, 3rd Viscount FitzWilliam

Irish noble (d. 1670)

Parents

• Thomas FitzWilliam, 1st Viscount FitzWilliam
• Margaret Plunkett

Children

• Catherine Fitzwilliam
• Thomas FitzWilliam, 4th Viscount FitzWilliam

Siblings

• Oliver FitzWilliam, 1st Earl of Tyrconnell
• Richard Fitzwilliam