Hemnes is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative centre of the municipality is the village of Korgen. Other villages include Bjerka, Bleikvasslia, Hemnesberget, and Sund.
The municipality sits south of the Ranfjorden and stretches south and east toward the border with Sweden. The Nordlandsbanen railway line and the European route E06 highway cross Hemnes on their way to the town of Mo i Rana about 20 kilometres (12 mi) to the northeast. The E6 highway enters Hemnes from the west through the Korgfjell Tunnel from Vefsn.
This municipality was established in 1839 when the old municipality of Rana was divided into Sør-Rana and Nord-Rana, shortly after the Formannskapsdistrikt law went into effect. Soon after, in 1844, Sør-Rana was renamed Hemnes.