Dayan Khan (Mongolian: Даян Хаан) (given name: Batumöngke; 1464–1517/1543) was a Mongol khan who reunited the Mongols under Chinggisid supremacy in the Northern Yuan dynasty based in Mongolia. His reigning title, "Dayan", means the "Great Yuan", as he enthroned himself as Great Khan of the Great Yuan, though the Yuan dynasty, the principal khanate of the Mongol Empire, had already been overthrown by the Chinese Ming dynasty a century earlier (1368). He is remembered as one of the most glorious Mongolian Emperors.

Dayan Khan and his queen, Mandukhai, eliminated Oirat power and abolished the taishi system used by both local and foreign warlords. Dayan Khan's victory at Dalan Tergin reunified the Mongols and solidified their corporate identity as Chinggisid people. His decision to divide the Six tumens of Eastern Mongolia as fiefs for his sons created decentralized but stable Borjigin rule over Mongolia for a century.

It is claimed that Batumongke was the son of Bayanmongke (Bayanmunh) (fl. 1470-79) the Bolkhu jinong (or crown prince/viceroy) of the Borjigin clan and Shiker Taiko (Shihir Taihu) of the Uriyangkhai in Mongolia. His paternal grandmother, Sechen, was a daughter of Esen Tayshi of the Oirats. Although Bolkhu and his family suffered through life's darkest hours during the reign of Esen and the internal conflict of the Northern Yuan Dynasty, they were welcomed by his uncle (brother) Manduul Khan (r. 1465-67) soon after his coronation.

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