Thomas FitzWilliam, 1st Viscount FitzWilliam

Irish peer (1581–1650)

Parents

• Sir Richard Fitzwilliam
• Jane Preston

Children

• Richard Fitzwilliam
• Oliver FitzWilliam, 1st Earl of Tyrconnell
• William FitzWilliam, 3rd Viscount FitzWilliam

Siblings

• Catharine Fitzwilliam
• Mary Fitzwilliam

Partners

• Margaret Plunkett