Sortland^ⓘ (Norwegian) or Suortá (Northern Sami) is a municipality in Nordland county, Norway. It is part of the traditional region of Vesterålen. The administrative centre of the municipality is the town of Sortland. Other population centres in Sortland include the villages of Bø, Holand, Holmstad, Liland, Sigerfjord, Strand, and Vik. The Norwegian Coast Guard has its northern base in Sortland, called Kystvaktskvadron Nord.

In 1997, the municipal council declared "town status" for the urban area of Sortland. Sortland is the largest town and commercial centre in Vesterålen. The town of Sortland is located close to the Sortland Bridge which crosses the Sortlandsundet strait and connects the two large islands of Langøya and Hinnøya by road. Since a lot of houses in the town are painted blue, Sortland is sometimes referred to as "the blue city".

The 722-square-kilometre (279 sq mi) municipality is the 159th largest by area out of the 357 municipalities in Norway. Sortland is the 109th most populous municipality in Norway with a population of 10,618. The municipality's population density is 14.7 inhabitants per square kilometre (38/sq mi) and its population has increased by 4.8% over the previous 10-year period. In January 2012, the number of citizens in Sortland reached 10,000 for the first time.

The municipality of Sortland was established in 1841 when it was separated from the large Hadsel Municipality.

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1963, the Holm area (population: 65) along the Gavlfjorden was transferred from Langenes Municipality to Sortland Municipality. Also on that date, the area around the inner and western part of the Eidsfjorden (population: 1,360) was transferred from Hadsel Municipality to Sortland Municipality.

On 1 January 2000, the area surrounding the Godfjorden was transferred from Kvæfjord Municipality (and Troms county) to Sortland Municipality (and Nordland county).

The municipality (originally the parish) is named after the old Sortland farm (Old Norse: Svortuland) since the first Sortland Church was built there. The first element is Svort which is the genitive case of the local river name Svorta. The river name is derived from svartr which means "black" or "dark". The last element is land which means "land" or "farm".

There are several theories as to the origin of the name, one of the most popular is that it named from the black fertile soil. Some deny that the first element of the name "Sort" is derived from the color black and instead insist on the origin coming from the native Sami place name "Soarta", which is a theory favored by the local historian Johan Borgos. Another theory is that the name came from the viking age, where it is thought to have meant "Land of the black birds" referring to the area people would hunt and catch small black birds like the Common blackbird (Svarttrost). This is a theory proposed by author and newspaper editor Ronny Jarl Jensen who points to Svortland in Bømlo Municipality, Vestland county as having a similar etymology.