Gerald O'Sullivan

Gerald O'Sullivan may refer to:


 * Gerald O'Sullivan (judge) (1891–1960), Australian judge, acting Judge on the New South Wales Supreme Court
 * Gerald Robert O'Sullivan (1888–1915), Irish soldier in the British Army and recipient of the Victoria Cross
 * Gearóid O'Sullivan (1891–1948), 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