Osterøy is an island municipality in Hordaland county, 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, while the settlement with the largest population is the village of Valestrandfossen with 1,101 inhabitants as of 1 January 2012.

Osterøy municipality covers the majority of the island of the same name, and the mostly uninhabited north-eastern part of the island is part of Vaksdal municipality. Osterøy is located just northeast of the city of Bergen, and 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, which represents the traditional way of living for farmers, is located on the south side of the island.

The municipality sits on the island of Osterøy, and it is surrounded by several fjords: Osterfjorden-Romarheimsfjorden, Sørfjorden, and Veafjorden. The highest mountain in the municipality is the 868-metre (2,848 ft) tall Høgafjellet on the municipal border with Vaksdal. The Lonevågen fjord cuts in the center of the island, with the village of Lonevåg sitting at the end of the fjord.

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