Chagatai may refer to:
- Chagatai Khan, the second son of Genghis Khan
- Chagatai language, an extinct Turkic language once widely spoken in central Asia
- Chagatai people, also known as Chagatai Tajiks. The origin of the people is unknown, though the name is from Chagatai Khan
- Chughtai, a family name in Asia and the Middle East
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