Tüdevtei (Mongolian: Түдэвтэй [ˌtʰʉtɪɸˈtʰe]), also spelt Tüdeutei or Tüdebhtei, is a sum of Zavkhan Province in western Mongolia.

Sum centre is 17 km South of Oigon Lake.

In 2005, its population was 2,003.

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