Adad in Akkadian and Ishkur in Sumerian and Hadad in Aramaic are the names of the storm-god in the Babylonian-Assyrian pantheon. All three are usually written by the logogram ^dIM. The Akkadian god Adad is cognate in name and functions with northwest Semitic god Hadad.

In Akkadian, Adad is also known as Ramman ("Thunderer") cognate with Aramaic Rimmon which was a byname of the Aramaic Hadad. Ramman was formerly incorrectly taken by many scholars to be an independent Babylonian god later identified with the Amorite god Hadad.

The Sumerian Ishkur appears in the list of gods found at Fara but was of far less importance than the Akkadian Adad later became, probably partly because storms and rain are scarce in southern Babylonia and agriculture there depends on irrigation instead. Also, the gods Enlil and Ninurta also had storm god features which decreased Ishkur's distinctiveness. He sometimes appears as the assistant or companion of one or the other of the two.

When Enki distributed the destinies, he made Ishkur inspector of the cosmos. In one litany Ishkur is proclaimed again and again as "great radiant bull, your name is heaven" and also called son of An, lord of Karkara; twin-brother of Enki, lord of abundance, lord who rides the storm, lion of heaven.