Træna is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative centre of the municipality is the island/village of Husøya. Other population centres include Selvær and Sanna.

Helgeland is the most southerly district in Northern Norway. Generally speaking, Helgeland refers to the part of Nordland county that is located south of the Arctic Circle. It is bordered in the north by the Saltfjellet mountains and Svartisen glacier, which form a natural border with the Salten district. In the south, Helgeland borders Trøndelag county.