Gautier or Walter V of Brienne (c. 1278 – 15 March 1311) was born in Brienne-le-Château, Aube, Champagne, France. He was the son of Hugh, Count of Brienne and Lecce, and Isabella de la Roche, daughter of Guy I de la Roche, Duke of Athens. He was the heir of the Brienne claim to the Kingdom of Jerusalem and of Cyprus, as well as to Taranto and Sicily.Walter spent his youth as a hostage in Sicily, in the castle of Agosta.