Guy of Ibelin, of the Ibelin family, was count of Jaffa and Ascalon during the latter part of the Crusades. He was the son of John of Ibelin and Maria of Barbaron. He was count in name only. His father, John of Jaffa, had died in 1266, after which the fragile truce with the Muslims collapsed, and Jaffa was captured by Baibars in 1268. John was probably succeeded by Guy's older brother James, who held the title of Count of Jaffa until his death in 1276, at which point the title passed to Guy.