In Sumerian mythology, Nanna is the moon god associated with the city of Ur.
Nanna, also called Suen or Sin in later Akkadian tradition, was one of Mesopotamia’s major astral deities. His principal cult center was Ur in southern Mesopotamia, where the great ziggurat was dedicated to him. The moon’s phases made Nanna important to calendars, ritual timing and observations of the night sky.
Nanna is commonly presented as the father of Inanna and Utu in Sumerian genealogical traditions, although ancient mythological relationships can vary by text. His consort is Ningal, a goddess connected with Ur.
Nanna should not be confused with Utu, the sun god, or with Nergal, a deity associated with war and the underworld. The name Nanna belongs especially to the Sumerian tradition, while Sin is the better-known Akkadian form.