Gerald O'Sullivan

• Gerald O'Sullivan (judge), Australian judge, acting Judge on the New South Wales Supreme Court
• Gerald Robert O'Sullivan, Irish soldier in the British Army and recipient of the Victoria Cross
• Gearóid O'Sullivan, Irish teacher, army officer, barrister and Sinn Féin and Fine Gael politician.
• Gerald O'Sullivan (Lieutenant-General) Irish Defence Forces Chief of Staff 1984-1986