Selbjørnsfjorden is a fjord in Hordaland county, Norway. The long fjord flows east-west between the municipalities of Austevoll, Fitjar, and Bømlo. It is a wide fjord that starts at the Slåtterøy Lighthouse at the North Sea in the west and flows to the strait of Langenuen in the east. The central part of the fjord reaches about wide. The fjord is named after the nearby island of Selbjørn.