Lugaldukuga (Sumerian: "lord of the holy mound") was a Mesopotamian god primarily understood as a theogonic figure. He is best attested as the father of Enlil, the head of the Mesopotamian pantheon, though other traditions about the parentage of the latter also existed, and no references to him in this role are known from before the Kassite period. Sometimes he could also be described as his grandfather instead. He was envisioned as a no longer active and as an inhabitant of the underworld. He could be equated with other deities of similar character, such as Enmesharra. It is not known which part of Mesopotamia he originated in, though references to him are known from texts from both Babylonia and Assyria.