The Balmi River is a river in Fauske Municipality in Nordland county, Norway. It flows about 6.5 km (4.0 mi) from the lake Kjelvatnet at an elevation of 510 meters (1,670 ft) north to the lake Langvatnet at an elevation of 127 meters (417 ft). The river has a drainage basin of 439 square kilometers (169 sq mi). The river is located a short distance south of the village of Sulitjelma and about 35 kilometres (22 mi) southeast of the Fauske.