Andøy is the northernmost municipality in Nordland county, Norway. It is part of the Vesterålen archipelago. The main island in the municipality is Andøya. The administrative centre of the municipality is the village of Andenes at the northernmost point in the municipality. Other villages in the municipality include Bjørnskinn, Bleik, Dverberg, Fiskenes, Fornes, Nordmela, Risøyhamn, Skarstein, Å, Åknes, and Åse.
The 656-square-kilometre (253 sq mi) municipality is the 172nd largest by area out of the 357 municipalities in Norway. Andøy Municipality is the 191st most populous municipality in Norway with a population of 4,553. The municipality's population density is 6.9 inhabitants per square kilometre (18/sq mi) and its population has decreased by 8.8% over the previous 10-year period.