Abu Sa'id Bahadur Khan (June 2, 1305, Ujan – December 1, 1335) (Persian, Arabic: ابو سعید بہادر خان ), also spelt Abusaid Bahador Khan, Abu Sa'id Behauder (Mongolian: ᠪᠦᠰᠠᠢ ᠪᠠᠬᠠᠲᠦᠷ ᠬᠠᠨ᠂ Busayid Baghatur Khan, Бусайд баатар хаан/Busaid baatar khaan, [ˈbusæt ˈbaːtər xaːŋ] in modern Mongolian), was the ninth ruler of Ilkhanate c. 1316-1335. This kingdom encompasses the present day countries of Iran, Azerbaijan, Georgia, and Armenia, as well as portions of Iraq, Turkey, Afghanistan, and Pakistan.

After defeating the forces of Golden Horde and the rebellion groups of the Keraites Rinchin, in 1306 and 1322 respectively, the Mongols gave the infant heir-apparent of Öljaitü, Abu Sa'id, the title of Baghatur (from Mongolian "баатар", meaning "hero, warrior").

During the earlier years of Abu Sa'id's reign, the Judeo-Muslim scholar and Vizier Rashid-al-Din Hamadani was beheaded. This left the emir Chupan as the de facto ruler of Ilkhanate. In 1325, Chupan defeated a force led by Muhammad Üzbeg, Khan of the Golden Horde. In turn, the emir Chupan invaded the Golden Horde's territories.

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