Flakstad is a municipality in Nordland county, Norway. It is part of the traditional district of the island group Lofoten. The administrative centre of the municipality is the village of Ramberg. Other villages in the municipality include Fredvang, Napp, Nusfjord, Sund, and Vareid.

The municipality is located in the Lofoten Islands and comprises the entire island of Flakstadøya and the northern part of the island of Moskenesøya, plus many smaller islets surrounding the main islands. The European route E10 highway runs across the whole municipality.

The 179-square-kilometre (69 sq mi) municipality is the 312th largest by area out of the 357 municipalities in Norway. Flakstad Municipality is the 318th most populous municipality in Norway with a population of 1,229. The municipality's population density is 6.9 inhabitants per square kilometre (18/sq mi) and its population has decreased by 10.2% over the previous 10-year period.

The municipality of Flakstad was established on 1 January 1838 (see formannskapsdistrikt law). On 1 July 1916, the southern part of the municipality (population: 1,306) was separated to form the new Moskenes Municipality. This left Flakstad with 1,667 residents.

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, Flakstad Municipality (population: 2,067) was merged into the neighboring Moskenes Municipality (population: 2,001), creating a new, larger Moskenes Municipality. This merger, however, only lasted for twelve years. On 1 January 1976, the merger was undone with Moskenes Municipality (population: 1,705) and Flakstad Municipality (population: 2,007) becoming separate municipalities once again.

The municipality (originally the parish) is named after the old Flakstad farm (Old Norse: Flakstaðir or Flatarstaðir) since the first Flakstad Church was built there. The first element of the name is uncertain. It may come from the word flak which may have meant "reckless". Another option is that it derived from the word flag which meant "rock wall", possibly referring to the large cliff near the church site. The last element is the plural form of staðr which means "homestead", "abode", or "farm".

The coat of arms was granted on 14 July 1989. The official blazon is "Azure, a mooring bollard argent" (Norwegian: I blått en sølv tørnbolt). This means the arms have a blue field (background) and the charge is a mooring bollard which is a type of fixed device used for tying a hawser line from a boat to the dock. The mooring bollard 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 blue color in the field symbolizes the importance of the sea and the mooring bollard was chosen to represent the municipality's seafaring history. The arms were designed by Jorunn Thomassen and Jarle Henriksen.

The Church of Norway has one parish (sokn) within Flakstad Municipality. It is part of the Lofoten prosti (deanery) in the Diocese of Sør-Hålogaland.