Gambon lair ing Cabra, Dublin, nalika Perang Donya II. Bapaké, Edward Gambon, makarya dadi tèknisi, lan ibuké, Mary (née Hoare), was a seamstress. As his father decided to seek work in the rebuilding of London, the family moved to Mornington Crescent in north London, when Gambon was five. His father had him made a British citizen, a decision that would later allow Gambon to receive a substantive, rather than honorary, knighthood and CBE.