Abu Sa'id Bahadur Khan, also spelled Abusaid Bahador Khan, Abu Sa'id Behauder, was the ninth ruler of the Ilkhanate, a division of the Mongol Empire that encompassed the present day countries of Iran, Azerbaijan, Georgia, and Armenia, as well as parts of Iraq, Turkey, Afghanistan, and Pakistan. After his death in 1335, the Ilkhanate disintegrated.

The Ilkhanate or Il-khanate, ruled by the Il-Khans or Ilkhanids, and known to the Mongols as Hülegü Ulus, was a Mongol khanate established from the southwestern sector of the Mongol Empire. The Ilkhanid realm was officially known as the Land of Iran or simply Iran. It was established after Hülegü, the son of Tolui and grandson of Genghis Khan, inherited the West Asian part of the Mongol Empire after his brother Möngke Khan died in 1259.