Delüün () is a sum (village) of Bayan-Ölgii Province in western Mongolia. It is primarily inhabited by ethnic Kazakhs. It´s named for Deluun River, a source of the Buyant River. As of 2014 it had a population of 6,994 people.

Administrative divisions The district is divided into 12 bags, which are: Tal Nuur Angirlag Khar Uul Chikhertei Rashaant Buga Khukh Serkh Burged Khukh Tolgoi Khuiten Nuur Khviten Buir Shine Ail

Economy The district is home to the Buraat tungsten deposit, which is owned by Dream Land LLC.

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