Qamar-ud-din Khan Dughlat (Urdu; Persian; Arabic: قمر الدین خان دغلت) was a Mongol ruler of Moghulistan between 1368 and 1392. He belonged to the Dughlat clan of Mongol warlords. Under Tughlugh Timur, both Amirs Tuluk and Bulaji had held the office of ulus beg. After the death of Bulaji the office was given to his son Khudaidad. This was contested by Bulaji's brother, Qamar-ud-din, who desired to be ulus beg himself. His request for the office to be transferred to him was refused by Tughlugh Timur; consequently after the latter's death Qamar-ud-din revolted against Tughlugh Timur's son Ilyas Khoja Khan.