The Delger mörön (, "wide river") is a river in the Khövsgöl aimag in northern Mongolia. Together with the Ider River it is one of the 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 Tömörbulag. The Delgermörön is frozen 128–175 days per year. There is a ferry in Bayanzürkh and a concrete bridge just south of Mörön.