Mes-sanga-Unug (dMES.SANGA.UNUGki; also read Pisangunug) was a Mesopotamian god closely associated with the city of Uruk, and especially with one of its districts, Kullaba. He was regarded as a warrior deity. In early sources he was described as the "great ensi of Inanna," but later on he was seemingly associated with Anu instead. He belonged to the earliest pantheon of Uruk, though he ceased to be worshiped there in the Ur III period, and the attestations in documents from the reign of the Seleucids are assumed to be a result of a late reintroduction. He was also venerated in Babylon, where he had two temples. Further attestations from outside Uruk come from various god lists.