Sir Gilbert Debenham (junior) (1432–1500) was an English knight, politician and soldier who served briefly as Lord Chancellor of Ireland. Although, like his father before him, he had a notorious reputation for lawlessness, he flourished in the reign of King Edward IV, due in part to his loyalty to Edward during the great political crisis of the years 1469–71. Under Henry VII he was attainted for treason and spent his last years in prison. He figures prominently in the Paston Letters.