Kadi Burhan al-Din Ahmed (Azerbaijani: Qazi Bürhanəddin, Turkish: Kadı Burhaneddin; died 1398) was vizier and atabeg to the Eretnid rulers of Anatolia. In 783 AH (1381–1382) he took over Eretnid lands and claimed the title of sultan for himself. He is most often referred to by the title “kadi“, or Islamic judge, his first position under the Eretnids.
Burhan al-Din justified his claim to the throne through descent from the Seljuks: his grandmother was the granddaughter of Kaykaus II. The Eretnid sultanate he inherited had a large Turkmen and Mongol population but also contained many of the older, established urban centers of the Seljuks of Rum and Ilkhanid Anatolia. The sultanate resembled these older states more than the Turkmen beyliks then ascendant in other parts of Anatolia.
'Aziz ibn Ardashir Astarbadi, a companion of Kadi Burhan al-Din, wrote a Persian language history of his rule called Bazm-u Razm which was edited by M. F. Köprülüzade in 1928. An analysis and commentary has been provided by H. H. Giesecke, Das Werk des ‘Azīz ibn Ardašīr Astarābādi (Leipzig, 1940).