Momchil (, , ;  – 7 July 1345) was a 14th-century Bulgarian brigand and local ruler. Initially a member of a bandit gang in the borderlands of Bulgaria, Byzantium and Serbia, Momchil was recruited by the Byzantines as a mercenary. Through his opportunistic involvement in the Byzantine civil war of 1341–1347, where he played the various sides against each other, he became ruler of a large area in the Rhodopes and western Thrace.