Marduk-apla-iddina I, contemporarily written in cuneiform as 𒀭𒀫𒌓𒌉𒍑𒋧𒈾 ᵈAMAR.UTU-IBILA-SUM-na and meaning in Akkadian: "Marduk has given an heir",[1] was the 34th Kassite king of Babylon c. 1171–1159 BC (short chronology).

He claimed, like his father, descent from Kurigalzu and evidently kept court in Dūr-Kurigalzu itself because tablets found in the burnt ruins of the Tell-el-Abyad quarter which marked the later Elamite destruction of the city, are dated in the first two years of his reign.

These include lists of garments received or distributed for the New Year, or akitu, festival and indicate a normal economic relationship with Babylonia's western and eastern neighbors, the Subarians and Elamites respectively, whose singers apparently entertained the royal household.

[2] Documents surviving from his reign date only as late as his sixth year[i 4] and include his repair of the E-zida temple at Borsippa,[i 5] where he credited the god Enlil with raising him to kingship despite recording this in an inscription wholly dedicated to Marduk.

[3] There is evidence of thriving commerce in woolen garments with Assyrian traders,[i 6] and numerous royal land grants in northern and especially northeastern Babylonia.