Fusa () is a former municipality in the old Hordaland county, Norway. The municipality existed from 1856 until its dissolution in 2020. The area is now part of Bjørnafjorden Municipality in the traditional district of Midhordland in Vestland county. The administrative centre was the village of Eikelandsosen. Other villages in the municipality included Fusa, Holdhus, Holmefjord, Strandvik, and Sundvor.
Prior to its dissolution in 2020, the municipality was the 247th largest by area out of the 422 municipalities in Norway. Fusa Municipality was the 235th most populous municipality in Norway with a population of about . The municipality's population density was and its population had increased by 1.8% over the previous 10-year period.
The Frank Mohn company's Fusa marine division was headquartered in the municipality, with almost 500 employees.
The parish of Fuse (later spelled Fusa) was established as a municipality in 1856 when the large Os Municipality was divided in two. Initially, the new Fuse Municipality had 3,173 residents.
On 1 January 1903 Fusa Municipality was divided into three municipalities as follows:
During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, Fusa Municipality was enlarged by merging the following areas:
On 1 January 2020, Fusa Municipality and Os Municipality were merged to form the new Bjørnafjorden Municipality. Historically, this municipality was part of the old Hordaland county. Also on 1 January 2020, the new Bjørnafjorden Municipality became a part of the newly-formed Vestland county (after Hordaland and Sogn og Fjordane counties were merged).
The municipality (originally the parish) is named after the old Fusa farm () since the first Fusa Church was built there. The meaning of the name is uncertain. The name could be the plural form of the word which means "eager" or "longing". Another possibility is that it comes from the verb or its alternate spelling which both mean "to rush" (as in rushing water). Historically, the name of the municipality was spelled Fuse. On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Fusa.
The coat of arms was granted on 27 September 1991 and it was in use until 1 January 2020 when the municipality was dissolved. The official blazon is "Argent, three azure in pall" (). This means the arms have a field (background) has a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used. The charge is a set of three spirals, two over one. The design was chosen to symbolise the strong currents in the Fusafjorden and Bjørnafjorden. The spirals also symbolise the many giant's kettles () in the municipality, which were created by the water in the rocks. The arms were designed by Arvid Sveen. The municipal flag has the same design as the coat of arms.
The Church of Norway had one parish () within Fusa Municipality. It was part of the Hardanger og Voss prosti (deanery) in the Diocese of Bjørgvin.
Fusa Municipality was located at the inner end of the Bjørnafjorden and its small arm, the Fusafjorden. Os Municipality was located across the fjord to the west, Samnanger Municipality was to the north, Kvam Municipality was to the east, and Kvinnherad Municipality was to the south. Lakes in Fusa included Gjønavatnet, Skogseidvatnet, and Henangervatnet. The highest point in the municipality was the tall mountain Tveitakvitingen, located on the northern border of the municipality.
While it existed, Fusa Municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, welfare and other social services, zoning, economic development, and municipal roads and utilities. The municipality was governed by a municipal council of directly elected representatives. The mayor was indirectly elected by a vote of the municipal council. The municipality was under the jurisdiction of the Bergen District Court and the Gulating Court of Appeal.
The municipal council of Fusa Municipality was made up of 21 representatives that are elected to four year terms. The party breakdown of the final municipal council was as follows:
The mayor () of Fusa Municipality was the political leader of the municipality and the chairperson of the municipal council. In 2007, Fusa participated in a national trial where the mayor was directly elected. The sitting mayor, Hans S. Vindenes, won the election with 51.8% of the votes. The following people have held this position: