Austevoll consists of 667 islands off the west coast of Western Norway. The municipality has a total land area of and a coastline of . It lies south of the Korsfjorden, west of the Bjørnafjorden, and north of the Selbjørnsfjorden. The highest point in Austevoll is the mountain Loddo, reaching above sea level. The Marstein Lighthouse lies in the northwestern part of the municipality.