| Delüün District | |
| Native Name: | Дэлүүн сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Bayan-Ölgii Province |
| Area Total Km2: | 5,594.99 |
| Population As Of: | 2014 |
| Population Total: | 6,994 |
| Timezone: | UTC + 7 |
| Utc Offset: | +7 |
Delüün (Mongolian: Дэлүүн) is a sum (village) of Bayan-Ölgii Province in western Mongolia. It is primarily inhabited by ethnic Kazakhs. As of 2014 it had a population of 6,994 people.[1]