Guido I Embriaco or Guy I of Gibelet (born c. 1180; died after September 1238) was "Lord (Signore) of Gib(e)let" or "Gibelletto", the modern and historic Byblos in Lebanon.
Hugo III had been forced to give the Lordship of Gibelet to Saladin in 1187 after being captured by him at the battle of Hattin.
In 1217, Guido fought alongside Leopold VI, Duke of Austria in the Fifth Crusade and in 1218–1219 he joined the Siege of Damietta in Egypt.
He came into conflict with the Ibelin family and thus supported Frederick II in his Sixth Crusade.
In August 1228, he took part in the conquest of Nicosia on Cyprus alongside Balian of Sidon.