Osterøy Municipality

Osterøy is an islandmunicipality in Vestlandcounty, Norway. It is located in the traditional district of Nordhordland. The municipality encompasses most of the island of Osterøy. The administrative centre of Osterøy is the village of Lonevåg in the central part of the island. The largest settlement is the village of Valestrandfossen with 1,380 inhabitants as of 1 January 2025.

Osterøy municipality and Vaksdal Municipality are both located on the island of Osterøy. Osterøy municipality covers most of the island with the mostly uninhabited northeastern part of the island belonging to Vaksdal Municipality. Osterøy is located a short distance northeast of the city of Bergen. It is surrounded by the Osterfjorden, Sørfjorden, and Veafjorden. The 19th-century musician and composer Ole Bull had a summer home in Valestrandfossen in Osterøy. The historic Havrå farm is a cluster farm which represents the traditional way of living for farmers. Havrå is located on the southeastern part of the municipality.

The 255.11-square-kilometre (98.50 sq mi) municipality is the 285th largest by area out of the 357 municipalities in Norway. Osterøy Municipality is the 131st most populous municipality in Norway with a population of 8,172. The municipality's population density is 32 inhabitants per square kilometre (83/sq mi) and its population has increased by 5.3% over the previous 10-year period.