Karduniaš, also transcribed Kurduniash, Karduniash, Karaduniše,) is a Kassite term used for the kingdom centered on Babylonia and founded by the Kassite dynasty. It is used in the 1350-1335 BC Amarna letters correspondence, and is also used frequently in Middle Assyrian and Neo-Assyrian texts to refer to the kingdom of Babylon. The name Karaduniyaš is mainly used in the letters written between Kadashman-Enlil I or Burna-Buriash, Kings of Babylon, and the Pharaoh of Ancient Egypt -, letters EA 1-EA 11, a subcorpus of letters,.

Babylonia was an ancient Akkadian-speaking state and cultural area based in the city of Babylon in central-southern Mesopotamia. It emerged as an Akkadian populated but Amorite-ruled state c. 1894 BC. During the reign of Hammurabi and afterwards, Babylonia was retrospectively called "the country of Akkad", a deliberate archaism in reference to the previous glory of the Akkadian Empire. It was often involved in rivalry with the older ethno-linguistically related state of Assyria in the north of Mesopotamia and Elam to the east in Ancient Iran. Babylonia briefly became the major power in the region after Hammurabi created a short-lived empire, succeeding the earlier Akkadian Empire, Third Dynasty of Ur, and Old Assyrian Empire. The Babylonian Empire rapidly fell apart after the death of Hammurabi and reverted to a small kingdom centered around the city of Babylon.