Ballangen (Northern Sami: Bálák) is a former municipality in Nordland county, Norway. The municipality existed from 1925 until its dissolution in 2020 when it became part of Narvik Municipality. The 932-square-kilometre (360 sq mi) municipality was part of the traditional district of Ofoten. The administrative centre of the municipality was the village of Ballangen. Other villages in the municipality included Bjørkåsen, Kjeldebotn, Kobbvika, and Skarstad.

Prior to its dissolution in 2020, the 932-square-kilometre (360 sq mi) municipality was the 119th largest by area out of the 422 municipalities in Norway. Ballangen Municipality was the 292nd most populous municipality in Norway with a population of 2,470. The municipality's population density was 2.6 inhabitants per square kilometre (6.7/sq mi) and its population had decreased by 5.8% over the previous 10-year period.

The municipality bordered Narvik Municipality to the east and Tysfjord Municipality to the south, and had a short border with Sweden to the southeast. Ballangen was situated on the southern shore of Ofotfjorden. Ballangen also included the long and narrow Efjorden, just south of the much larger Ofotfjorden. Its immediate surroundings were dominated by fjords, mountains, and forests. Ballangen relied on the nearby town of Narvik as its economic base.

The municipality of Ballangen was established on 1 July 1925 when it was separated from the large Evenes Municipality. The new municipality encompassed all of the area of Evenes Municipality that was located south of the Ofotfjorden. Initially, Ballangen had 3,270 residents.

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1962, the southern part of Lødingen Municipality (the island of Barøya and the area surrounding the Efjorden; population: 433) was transferred from Lødingen Municipality to Ballangen Municipality.

On 1 January 2020, the municipality was merged with the neighboring Narvik Municipality and the eastern half of Tysfjord Municipality to form a new, larger Narvik Municipality. This decision had been reached in 2017 after national and local discussions involving municipal mergers.

The coat of arms was granted on 18 July 1980 and it was in use until 1 January 2020 when the municipality was dissolved. The official blazon is "Vert, a hammer Or in pale" (Norwegian: På grønn bunn en gull opprett hammer). This means the arms have a green field (background) and the charge is an upright hammer. The hammer has a tincture of Or which means it is commonly colored yellow, but if it is made out of metal, then gold is used. The green color in the field symbolizes the importance of agriculture and the hammer was chosen to represent mining in the municipality. There used to be copper mines in the municipality. The arms were designed by Hallvard Trætteberg.

The municipality is named after the old Ballangen farm (Old Norse: Bagangr) which is located at the head of a small fjord with the same name. The first element is bag which has an unknown meaning. The last element is angr which means "fjord".