Narvik^ⓘ (Northern Sami: Áhkanjárga) is the third-largest municipality in Nordland county, Norway, by population. The administrative centre of the municipality is the town of Narvik. Some of the notable villages in the municipality include Ankenesstrand, Ballangen, Beisfjord, Bjerkvik, Bjørnfjell, Elvegården, Kjøpsvik, Skjomen, Håkvik, Hergot, Straumsnes, and Vidrek. The Elvegårdsmoen army camp is located near Bjerkvik.

Narvik is located on the shores of the Ofotfjorden. The municipality is part of the traditional district of Ofoten of Northern Norway, inside the Arctic Circle. Narvik Municipality borders Hamarøy Municipality to the southwest; Evenes Municipality to the northwest; Bardu Municipality, Gratangen Municipality, Lavangen Municipality, and Tjeldsund Municipality (in Troms county) to the north; and Norrbotten County (Lapland) in Sweden to the south and east.

The 3,432-square-kilometre (1,325 sq mi) municipality is the 10th largest by area out of the 357 municipalities in Norway. Narvik Municipality is the 61st most populous municipality in Norway with a population of 21,580. The municipality's population density is 6.3 inhabitants per square kilometre (16/sq mi) and its population has increased by 15.4% over the previous 10-year period.

The municipality of Narvik was established on 1 January 1902 when the village of Narvik received status as a proper town (kjøpstad) and was separated from the large Ankenes Municipality. Initially, the town-municipality of Narvik had 3,705 residents.

On 1 January 1974, Ankenes Municipality was merged with the town-municipality of Narvik, forming a new, larger Narvik Municipality. After the merger, the new Narvik Municipality had 19,780 residents. On 1 January 1999, a small area of Narvik Municipality (population: 9) was transferred to the neighboring Evenes Municipality.

On 1 January 2020, Narvik Municipality was merged with the neighboring Ballangen Municipality and the eastern half of Tysfjord Municipality to form a new, larger Narvik Municipality. This occurred because in 2017 the municipal government agreed to merge after the Parliament of Norway required Tysfjord Municipality to be split up.

The coat of arms was adopted on 20 June 2019 for use starting on 1 January 2020 after a municipal merger. The blazon is "Azure, a mountain peak argent". This means the arms have a blue field (background) and the charge is a mountain peak. The mountain peak has a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used. The arms were designed to look like the local mountain Stetind. The arms were designed by Eirik Djupvik.

The coat of arms was granted on 1 June 1951 and they were in use until 1 January 2020 when there was a municipal merger. The official blazon is "Gules, an anchor Or" (Norwegian: På rød bunn et opprett gull anker). This means the arms have a red field (background) and the charge is an anchor. The anchor 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 anchor symbolises Narvik's status as an important port (the largest harbour in North Norway). The arms were designed by Hallvard Trætteberg.