Bayan of the Mergid (died 1340) was a Mongol general of the Mergid clan and an official in the Yuan Dynasty. At the turn of the 13th/14th centuries he, together with the Turk El Temür, was a member of the group around Qaishan, a nephew of Temür Khan who was appointed to defend Mongolia against the Chagatai Khanate under Kaidu, the grandson of Ögedei. In one battle, he repelled and chased the Ögedeid army; and was given the title of Baghatur. After Temür's death, Qaishan emerged as the new Yuan emperor, and Bayan was among those who received an official position as as reward. Later, Bayan was governour of Henan. Historians describe him as a traditionalist who attempted to preserve Mongolian culture while he is seen as a violent aristocrat by some.