Ninsun was a Mesopotamian goddess. She is best known as the mother of the hero Gilgamesh and wife of deified legendary king Lugalbanda, and appears in this role in most versions of the Epic of Gilgamesh. She was associated with Uruk, where she lives in this composition, but she was also worshiped in other cities of ancient Mesopotamia, such as Nippur and Ur, and her main cult center was the settlement KI.KALki.

Lugalbanda was a deified Sumerian king of Uruk who, according to various sources of Mesopotamian literature, was the father of Gilgamesh. Early sources mention his consort Ninsun and his heroic deeds in an expedition to Aratta by King Enmerkar.