Masfjorden is a municipality in the northern part of Hordaland county in Norway. The municipality is located in the Nordhordland district of the county. The administrative centre of the municipality is the village of Masfjordnes. Other villages in the municipality include Frøyset, Hosteland, Matre, and Solheim.

The municipality is centered on the Masfjorden which almost divides the municipality completely into a north side and a south side. A cable ferry crosses the fjord from Masfjordnes to Duesund in the western part of the municipality. The Matre Hydroelectric Power Station is located in the eastern part of the municipality.

The parish of Masfjorden was established as a municipality on 1 March 1879 when it was separated from the large municipality of Lindås. Masfjorden was the northern part of Lindås, and its initial population was 2,336. On 1 January 1964, the Einestrand, Eikebotn, and Kikallen area along the Austfjorden (population: 25) was transferred from Lindås to Masfjorden.

The municipality is named after the Masfjorden, the fjord which runs through it. The Old Norse form of the name was Matrsfjǫrðr. The first element is the genitive case of the old (uncompounded) name of the fjord: Matr. This name is derived from matr which means "food" - and the meaning of the fjord name is "the one full of food (fish)". The village of Matre lies at the inner end of the fjord, and that name has a similar origin.

The coat-of-arms is from modern times. They were granted on 28 September 1990. The arms feature three gold heldrer, a traditional tool made of wood for fastening a rope around a load. They are meant to symbolize unity as well as the importance of forestry. Three of these objects appear in yellow and they are centered on a field of red.

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