(Akkadian: “frontier,” or “boundary”), type of boundary stone used by the Kassites (Kassite) of ancient Mesopotamia. A stone block or slab, it served as a record of a grant of land made by the king to a favoured person.

The original kudurrus were kept in temples, while clay copies were given to the landowners. On the stone were engraved the clauses of the contract, the images or symbols of the gods under whose protection the gift was placed, and the curse on those who violated the rights conferred. The kudurrus are important not only for economic and religious reasons but also as almost the only works of art surviving from the period of Kassite rule in Babylonia (c. 16th–c. 12th century BC).