Otterøya or Otrøyna is an unpopulated island in Bømlo municipality in Vestland county, Norway.

The 0.45-square-kilometre (110-acre) island lies in the Bømlafjorden, southeast of the islands of Føyno, Nautøya, and Spyssøya.

The southern part of the island is a nature reserve.

[1] The Bømlafjord Tunnel runs underneath the island.

This article about an island in Vestland is a stub.