The judge of the Cumans (Hungarian: kunok bírája or kunbíró;Latin: iudex Cumanorum) was a short-lived legal office, then an ex officio title in the Hungarian royal court, existed since the second half of the 13th century. In 1270, the Palatine of Hungary assumed the dignity and became part of its title to merge the two positions for centuries.
The position most possibly evolved with the resettlement of the Cuman tribes following the Mongol invasion of Hungary in 1242. In the introductory of the so-called second Cuman law of 1279, King Ladislaus IV ("the Cuman") referred to his grandfather King Béla IV, who placed Cumans under the direct jurisdiction of the Palatine, accordingly. Nora Berend, among others, questioned the authenticity of the document and called an "18th century forgery" which served the purpose of historical legitimacy to the restoration (redemptio) of the autonomous Jassic-Cuman district by Maria Theresa in 1745. In contrast, historians Attila Zsoldos and Tibor Szőcs considered the text is authentic and claimed the Palatine received that authority already during the Cumans' first entry into Hungary in 1239, in anology to the status of the dignity of Count of the Pechenegs. Szőcs argues Denis Tomaj unusually held ispánates in Eastern Hungary beside his position of Palatine, which laid near to the Cuman tribes' lands, thus he could be the first office-holder who became judge of the Cumans. Contrary to Denis Tomaj, later Palatines after the Battle of Mohi (11 April 1241), for instance Ladislaus Kán, Denis Türje, Roland I Rátót and Henry Kőszegi originated from Transdanubian kindreds, causing the decline and marginalization of the dignity of judge of the Cumans, in addition to the emerging civil war between Béla IV and his son Duke Stephen.