Karlsøy is a village in the municipality of Hamarøy in Nordland county, Norway. It is located on the southern coast of the island of Finnøya, along the Sagfjorden, about 8 kilometres (5.0 mi) northwest of the village of Innhavet. Sagfjord Church is located in Karlsøy, serving the residents of this part of Hamarøy.
View of Karlsøy from Sagfjord Church