Hattfjelldal (Southern Sami: Aarborte and Northern Sami: Árbordi) 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 Hattfjelldal. Other villages include Grubben, Svenskvollen, and Varntresk. Hattfjelldal Airfield is located in the village of Hattfjelldal.