Guy of Ibelin, constable of Cyprus

Guy of Ibelin (French: Guy d'Ibelin; 1215/1218 – after May 1255) was marshal and constable of the Kingdom of Cyprus. He was the fifth son of John of Ibelin, the Old Lord of Beirut, and Melisende of Arsuf. He had close relations with the king of Cyprus, Henry I, acting as witness for two royal decrees; he was probably one of the King's executors named in a papal bull of Pope Alexander IV. With his brother Baldwin of Ibelin, he led the Cypriot crusaders in the siege of Damietta in 1248.

According to the medieval chronicler John of Joinville, he was one of the most accomplished knights of his generation and a benevolent ruler on Cyprus. Joinville recounts an episode when he, Guy and Baldwin had been taken prisoner by Saracen rebels:

Guy married Phillipa Berlais, daughter of Aimery Berlais. Their children were:

Baldwin, bailli of the Kingdom of Jerusalem, then constable of the Kingdom of Cyprus John, assassinated in 1277 Aimery Balian (1240–1302), seneschal of Cyprus, 1286–1302 Philip (1253–1318), seneschal of Cyprus, 1302–1318 Isabella (1241 † 1324), wife of King Hugh III of Cyprus Alice, married Odo of Dampierre Eschiva, a nun Melisende Marie