Abtai Sain Khan – alternately Abatai or Avtai (Mongolian: Автай хан, meaning who have the gift of witchcraft and good – was a Khalkha-Mongolian prince who was named by the 3rd Dalai Lama as first khan of the Tüsheet Khanate in 1587. He zealously propagated Tibetan Buddhism among the Khalkha Mongols and founded the Buddhist monastery of Erdene Zuu in 1585.