The Delger murun is a river in the Khuvsgul province in northern Mongolia. Delger murun flows just in the south edge of Murun city.
Delger river along with Ider is the main sources of the Selenge River. The source is in the Ulaan Taiga range close to the Russian border, the confluence with the Ider River is in Tumurbulag. The Delger murun is frozen 128–175 days per year. There is a ferry in Bayanzurkh and a concrete bridge just south of Murun town.