Voss () is a municipality and a traditional district in Vestland county, Norway. The administrative center of the municipality is the village of Vossevangen. Other villages include Bolstadøyri, Borstrondi, Evanger, Kvitheim, Mjølfjell, Oppheim, Stalheim, and Vinje.
The municipality is the 35th largest by area of Norway's 356 municipalities. Voss is Norway's 77th most populous municipality, with a population of 15,875. Its population density is and its population has increased by 6.5% over the last 10 years.
The parish of Voss was established as a municipality on 1 January 1838 (see formannskapsdistrikt law). On 1 January 1867, a small area in northern Voss (population 28) was transferred to the municipality of Hosanger. On 1 January 1868, the municipality's northern district (population 2,009) was separated to form the new municipality of Vossestrand. This left 7,592 residents in Voss. On 21 August 1868, an unpopulated area of northern Voss was transferred to Vossestrand. On 1 January 1885, the western district of Voss (population 2,045) was separated to form the new municipality of Evanger. This left Voss with 5,403 residents.
During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, the municipality of Voss (population 10,575), the municipality of Vossestrand (population 1,573), and most of the municipality of Evanger (population 1,075) were all merged into a new, larger municipality of Voss. (The rest of Evanger was merged into the new municipality of Vaksdal.)
On 1 January 2020, the neighboring municipality of Granvin merged with Voss, creating a larger Voss municipality. Before the merger, it was known as Voss kommune, but afterward it was called Voss herad, using the title herad which Granvin formerly had used.
The municipality (originally the parish) is named after the traditional district of Voss (Vǫrs). The name is likely derived from the word vǫrr which means "water" (likely the old district name was originally used as the name for the lake Vangsvatnet.