The Kudurru of Kaštiliašu' is a fragment of an ancient Mesopotamian narû, or entitlement stele, recording the legal action taken by Kassite king Kaštiliašu IV (c. 1232–1225 BC) over land originally granted by his forebear Kurigalzu II (c. 1332–1308 BC),[1] son of Burna-Buriaš II to Uzub-Šiḫu or -Šipak in grateful recognition of his efforts in the war against Assyria under its king, Enlil-nirari.

Along with the Tablet of Akaptaḫa, these are the only extant kudurrus from this king's short eight-year reign and were both recovered from Elamite Susa, where they had been taken in antiquity, during the French excavations under Jacques de Morgan at the end of the nineteenth century and now reside in the Musée du Louvre.

[2] Where the stele tapers to the top, it carries representations of the gods Sîn (crescent moon), Šamaš (solar-disc) and Ištar (eight-pointed star) in bas-relief.

This is Ugallu, "Big Weather Beast", one of the eleven monsters who were to be conquered by Marduk in the later publication, Enûma Eliš, and who was to feature on apotropaic figurines of the first millennium BC.

[4] The land grant was reconfirmed by Kaštiliašu, possibly to a descendant of the original beneficiary, perhaps due to the failure to provide a sealed legal document during the earlier bequest.