Ala al-Din Tekish (Persian: علاء الدين تكش; full name: Ala ad-Dunya wa ad-Din Abul Muzaffar Tekish ibn Il-Arslan) or Tekesh or Takesh was the Shah of Khwarazmian Empire from 1172 to 1200.

His rule was contested by his brother, Sultan Shah, who held a principality in Khorasan.

[4] In 1194, Tekish defeated the Seljuk sultan of Hamadan, Toghrul III, in an alliance with Caliph Al-Nasir, and conquered his territories.

He died of a peritonsillar abscess in 1200[5] and was succeeded by his son, Ala ad-Din Muhammad.

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