Walter of Montbéliard (died in 1212) was regent of the Kingdom of Cyprus from 1205 to 1210, and Constable of Jerusalem from around 1204 to his death.
He was the second son of Amadeus, Count of Montbéliard. He took the cross after the Fourth Crusade was announced in 1199. Two years later he joined his cousin, Walter III, Count of Brienne, who had laid claim to the Principality of Taranto and other domains in the Kingdom of Sicily and invaded Southern Italy. Before long, Walter left Southern Italy for the Holy Land.
King Aimery, King of Cyprus and Jerusalem, gave his eldest daughter, Burgundia, in marriage to Walter and also made him constable of Jerusalem. Aimery who died on 1 April 1205 was succeeded by his ten-year-old son, Hugh I in Cyprus. The High Court elected Walter both guardian of the minor king and regent, violating the custom that prescribed that the two offices were to be separated.
The Seljuks laid siege to Satalia (now Antalya in Turkey), an important port in Asia Minor, in 1207. Satalia was held by an Italian adventurer, Aldobrandino. On Aldobrandino's demand, Walter intervened in the conflict and forced the Seljuks to lift the siege. However, the Greek citizens turned against him and expelled the Cypriot troops from the town with Seljuk assistance.
He arranged the marriage of Hugh I with Alice of Champagne, who was the eldest daughter of Henry, King of Jerusalem and Count of Champagne.