Svelgen or Svelgselva is a river in Bremanger Municipality in Sogn og Fjordane county, Norway. The river originates from the lake Hjelmevatnet, and empties into the Nordgulen fjord at the village of Svelgen. The river is regulated for exploitation of its hydropower. The four Svelgen Hydroelectric Power Stations, which exploit the Svelgen and neighbouring watersystems, have a combined installed capacity of 107 megawatts (143,000 hp).