| Delger mörön | |
| Name Etymology: | Mongolian: Delger mörön, "wide river") |
| Subdivision Type1: | Country |
| Subdivision Name1: | Mongolia |
| Subdivision Type2: | Aimags |
| Subdivision Name2: | Khövsgöl |
| Subdivision Type5: | Major city |
| Subdivision Name5: | Mörön |
| Length: | 445km (277miles) |
| Source1 Location: | Ulaan Taiga range |
| Mouth: | Selenge |
| Mouth Location: | Olon golyn bilchir |
| Mouth Coordinates: | 49.2611°N 100.6792°W |
| Basin Size: | 26640km2 |
| Tributaries Left: | Beltes River |
| Tributaries Right: | Bügsiin River |
The Delger mörön (Mongolian: Дэлгэр мөрөн|lit=wide river) is a river in the Khövsgöl aimag in northern Mongolia. It rises in the Ulaan Taiga range close to the Russian border. It is long, and has a drainage basin of .[1]
Together with the Ider River, it is the headwaters of the Selenge River. It meets with the Ider at Tömörbulag, thereafter becoming the Selenge.
The Delger mörön is frozen for 128–175 days through the year. There is a ferry in Bayanzürkh, and a concrete bridge just south of Mörön.