Balsfjord (Báhccavuotna ˈpaːhːt͡saˌvuo̯tna; Paatsivuono) is a municipality in Troms og Finnmark county, Norway. The administrative centre of the municipality is the village of Storsteinnes. Other villages include Mestervik, Mortenhals, and Nordkjosbotn. The municipality is the 58th largest by area out of the 356 municipalities in Norway. Balsfjord is the 168th most populous municipality in Norway with a population of 5,576. The municipality's population density is and its population has increased by 1.3% over the previous 10-year period. The municipality surrounds two fjords: Malangen and Balsfjorden, surrounded by comparatively rich farmlands under majestic peaks including the southern end of the Lyngen Alps. Balsfjord was originally a part of the great Tromsøe landdistrikt municipality, but it was separated from this in 1860 to form its own municipality. Balsfjord had an initial population of 3,610. On 1 January 1871, the northwestern part of the municipality (population: 1,425) was separated from it to create the new Malangen Municipality. This left Balsfjord with 2,255 inhabitants. On 1 January 1875, a part of Lyngen Municipality (population: 7) was transferred to Balsfjord. On 1 January 1905, a part of Balsfjord (population: 5) was transferred to Målselv Municipality. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, most of Balsfjord Municipality was merged with most of neighboring Malangen municipality to form a new, larger municipality of Balsfjord (population: 6,993). Also on that day, the Skogli ved Heia area (population: 2) was transferred to the neighboring Målselv Municipality and the uninhabited Elvebakken farm was transferred to the neighboring Storfjord Municipality. On 1 January 1966, the Sørelvmo area of Balsfjord (population: 131) was transferred to Målselv Municipality. On 1 January 2020, the municipality became part of the newly formed Troms og Finnmark county. Previously, it had been part of the old Troms county.