Musken (Norwegian) or Måsske (Lule Sami) is a village in the municipality of Hamarøy in Nordland county, Norway. It lies halfway along the long and small , an arm of the Tysfjorden. The village is not far from , where mainland Norway is at its narrowest, just 6 kilometres (3.7 mi) wide from the ocean shore to Sweden. Musken has Norway's only manual mail sorting centre. One of Northern Europe's deepest caves, Raggejavreraige, is located just south of Musken. The cave is 580 metres (1,900 ft) deep.