Halsa is a former municipality in Møre og Romsdal county, Norway. The municipality existed from 1838 until 2020 when it became part of Heim Municipality in Trondelag county. It was part of the Nordmøre region. The administrative centre of Halsa was the village of Liabøen. Other villages in the municipality included Todalen, Halsanaustan, Valsøyfjord, Engan, Hjellnes, and Valsøybotnen.

At the time of its dissolution in 2020, the 301-square-kilometre (116 sq mi) municipality was the 279th largest by area out of the 422 municipalities in Norway. Halsa was the 349th most populous municipality in Norway with a population of 1,571. The municipality's population density was 5.4 inhabitants per square kilometre (14/sq mi) and its population has decreased by 6% over the last decade.

The parish of Halsa was established as a municipality on 1 January 1838 (see formannskapsdistrikt law). On 1 January 1868, an unpopulated area of Halsa was transferred to the neighboring municipality of Straumsnes. On 1 January 1879, a part of Halsa (population: 279) was transferred to the neighboring municipality of Stangvik. The next year, the Torjulvågen area (population: 240) on the west side of the Halsafjorden was transferred to Tingvoll Municipality. On 1 July 1915, part of southern Halsa (population: 114) was transferred to Åsskard Municipality.

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1965, all of Valsøyfjord Municipality that was located on the mainland (population: 1,104) was merged into Halsa Municipality. On 1 January 1976, the district of Aure Municipality located south of the Vinjefjorden (population: 158) was transferred to Halsa Municipality.

On 1 January 2020, Halsa merged with the neighboring municipality of Hemne and the Ytre Snillfjord area in the municipality of Snillfjord to form Heim Municipality. The new municipality is located in Trøndelag county, which means that as part of the merger Halsa left Møre og Romsdal county and moved to Trøndelag.

The municipality (originally the parish) is named after the old Halsa farm (Old Norse: Hǫlsyinjar) since the first Halsa Church was built there. The first element comes from the plural form of the word hals which means "neck". Here, the word hals is referring to an isthmus (or neck of land) between two fjords: Halsafjorden and the Skålvikfjorden. The last element is vin which means "meadow" or "pasture". Historically, the name of the municipality was spelled Halse. On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Halsa.

The coat of arms was granted on 19 August 1988 and it was in use until 2020 when the municipality ceased to exist. The official blazon is "Per bend sinister embattled argent and azure" (Norwegian: Venstre skrådelt av sølv og blått ved tindesnitt). This means the arms have are divided with a diagonal line that is embattled. The field (background) below the line has a tincture of azure. Above the line, the field 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 embattled line symbolizes the municipal coastline since there are three fjords (Halsafjorden, Skålvikfjorden and Valsøyfjorden) protruding inland from the north coast of the municipality. The arms were designed by Asbjørn Heggem. The municipal flag has the same design as the coat of arms.

The Church of Norway had two parishes (sokn) within the municipality of Halsa. It was part of the Indre Nordmøre prosti (deanery) in the Diocese of Møre.

Churches in Halsa

Parish (sokn)	Church name	Location of the church	Year built
Halsa	Halsa Church	Halsanaustan	1734
Valsøyfjord	Valsøyfjord Church	Valsøyfjord	1864

Halsa had numerous fjords in and around the municipality including the Halsafjorden, Vinjefjorden, Arasvikfjorden, Skålvikfjorden, and Valsøyfjorden. The Valsøy Bridge crossed the Valsøyfjorden. There were ferry connections to Tingvoll Municipality to the west and to Aure Municipality to the north.

While it existed, this municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, unemployment, social services, zoning, economic development, and municipal roads. During its existence, this municipality was governed by a municipal council of directly elected representatives. The mayor was indirectly elected by a vote of the municipal council. The municipality falls under the Nordmøre District Court and the Frostating Court of Appeal.

The municipal council (Kommunestyre) of Halsa is made up of 15 representatives that are elected to four year terms. The party breakdown for the final municipal council was as follows:

The mayors of Halsa (incomplete list):

• 1999-2003: Ivar Betten (Ap)
• 2003-2007: Margrete Seter (LL)
• 2007-2019: Ola Rognskog (Sp)

Halsa was the location where the famous killer whale, Keiko, went when he was set free. Keiko died in December 2003 and was buried there. The people of Halsa have built a memorial cairn over Keiko's body, where people from all over the world are free to visit him. In the first year after his burial, around 5,000 people visited the grave but then fewer and fewer came and in 2007 only around 500 visitors paid him homage. In June 2008, hardly anyone had come to see the grave, so the municipality decided it would not continue keeping the grave in order.

• See also: Heim,_Norway § Notable_people

• List of former municipalities of Norway

• Media related to Halsa at Wikimedia Commons
• Trøndelag travel guide from Wikivoyage