Fjell is a former municipality in the old Hordaland county, Norway. It is part of the traditional district of Midhordland. The municipality consisted of several islands west of the city of Bergen, the major ones being Litlesotra, the northern part of Store Sotra, Bildøy, Bjorøy, Misje, and Turøy. The administrative centre of Fjell is the village of Straume. Some of the villages in Fjell included Ågotnes, Fjell, Foldnes, Knappskog, Knarrevik, Kolltveit, Landro, and Sekkingstad. On 1 January 2020, the municipality became part of Øygarden Municipality in Vestland county.
Due to the opening of the Sotra Bridge to the mainland in 1971 and its proximity to the city of Bergen, the population has grown from less than 7,000 to over 25,000 as of 2017. The result is major traffic jams over the bridge every day. The highway that leads to Bergen has reduced the traveling time to only fifteen minutes from the municipal centre at Straume on Litlesotra to the center of Bergen.
At the time of its dissolution in 2020, the municipality is the 355th largest by area out of the 422 municipalities in Norway. Fjell was the 43rd most populous municipality in Norway with a population of 25,204. The municipality's population density is and its population has increased by 21.2% over the last decade.
The parish of Fjæld was established as a municipality on 1 January 1838 (see formannskapsdistrikt law). During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, the islands of Misje and Turøyna (population: 404) were transferred from the municipality of Herdla to the municipality of Fjell.
On 1 January 2020, the three neighbouring municipalities of Fjell, Sund, and Øygarden were merged into one large island municipality called Øygarden.
The municipality (originally the parish) is named after the old Fjelde farm (Fjall) since the first Fjell Church was built there. The name is identical to the modern Norwegian word fjell which means "mountain".