Tysvær is a municipality in Rogaland county, Norway. It is part of the Haugalandet region. The municipality is located on the Haugalandet peninsula on the northern side of the Boknafjorden, just east of the towns of Kopervik and Haugesund. The administrative centre of the municipality is the village of Aksdal. Other villages in the municipality include Dueland, Førre, Grinde, Hervik, Hindaråvåg, Nedstrand, Skjoldastraumen, Susort, Tysvær, and Yrke.

The European route E39 highway and European route E134 highways traverse the municipality with their junction located at Aksdal in Tysvær. The Frekasund Bridge on the E39 highway connects the mainland of Tysvær to the island municipality of Bokn to the south. The Karmøy Tunnel connects Tysvær to the town of Kopervik in neighboring Karmøy municipality.

The 425-square-kilometre (164 sq mi) municipality is the 231st largest by area out of the 356 municipalities in Norway. Tysvær is the 101st most populous municipality in Norway with a population of 11,405. The municipality's population density is 28.5 inhabitants per square kilometre (74/sq mi) and its population has increased by 8.8% over the previous 10-year period.

The municipality of Tysvær was established in 1849 when it was separated from the large municipality of Skjold. Initially, the municipality had a population of 2,058. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1965, the following areas were merged into a newly enlarged municipality of Tysvær:

• the old municipality of Tysvær (population: 1,862)
• the municipality of Nedstrand (population: 1,200)
• the Gismarvik, Førre, and Stegaberg areas of Avaldsnes municipality (population: 994)
• the Grinde, Dueland, and Yrkje areas of Skjold municipality (population: 1,133)
• the Breidal and Stølsvik farms from Vats municipality (population: 16)
• the Hapnes and Dokskar farms from Vikedal municipality (population: 2)

On 1 January 1969, the small Sponevik farm area (population: 6), just north of the village of Skjoldastraumen, was transferred from the neighboring Vindafjord municipality to Tysvær.

The municipality (originally the parish) is named after the old Tysvær farm (Old Norse: Teitsfjörðr) since the first Tysvær Church was built there. The first element is the genitive case of the old male name Teitr. The last element is fjörðr which means "fjord". Over time, the last element was corrupted to vær which means "fishing village", but that was not the meaning of the original name.

The coat of arms was granted on 3 February 1984. The official blazon is "Azure, a heron argent issuant" (Norwegian: På blå grunn ein oppveksande sølv hegre). This means the arms have a blue field (background) and the charge is the top of a grey heron. The heron 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 heron was chosen as a symbol for the municipality since there are several large colonies of grey herons in the municipality. "Tysvær herons" is a nickname for the inhabitants of the municipality. The arms were designed by Stein Davidsen. The municipal flag has the same design as the coat of arms.

The Church of Norway has three parishes (sokn) within the municipality of Tysvær. It is part of the Haugaland prosti (deanery) in the Diocese of Stavanger.

Churches in Tysvær

Parish (sokn)	Church name	Location of the church	Year built
Førresfjorden	Aksdal Church	Aksdal	1995
	Førre Church	Førre	1893
Nedstrand	Nedstrand Church	Hindaråvåg	1868
	Skjoldastraumen Church	Skjoldastraumen	1910
Tysvær	Tysvær Church	Tysværvåg	1852

The municipality lies on the northern shore of the Boknafjorden, with the Skjoldafjorden and Vindafjorden both partially located within the municipality. The island of Borgøy lies in the middle of the Skjoldafjorden in Tysvær.

The lake Aksdalsvatnet is the largest lake in the municipality. Another notable lake is Stakkastadvatnet, which lies on the Haugesund-Tysvær municipal border.

Tysvær has a number of scenic walks including Heggelifjellet and Kvinnesland.

The Kårstø industrial site is located along the shores of the Boknafjorden in southwestern Tysvær. The site has many natural gas-related facilities including the Kårstø Power Station.

Tysvær Municipality is responsible for primary education (through 10th grade), outpatient health services, senior citizen services, welfare and other social services, zoning, economic development, and municipal roads and utilities. The municipality is governed by a municipal council of directly elected representatives. The mayor is indirectly elected by a vote of the municipal council. The municipality is under the jurisdiction of the Haugaland og Sunnhordland District Court and the Gulating Court of Appeal.

The municipal council (Kommunestyre) of Tysvær is made up of 29 representatives that are elected to four year terms. The tables below show the current and historical composition of the council by political party.

This list is incomplete; you can help by adding missing items. (July 2023)

The mayors (Norwegian: ordfører) of Tysvær (incomplete list):

• Cleng Peerson (1783 near Tysvær – 1865), leader of the first group of Norwegians to emigrate to the United States
• Anders Andersen Bjelland (1790 in Nedstrand – 1850), farmer and politician
• Asbjørn Kloster (1823 in Vestre Bokn – 1876), social reformer and leader of the Norwegian temperance movement
• Lars Hertervig (1830 at Borgøy – 1902), painter of semi-fantastical works of coastal landscapes
• John S. Tveit (born 1931 in Tysvær), politician who was mayor of Tysvær from 1967 to 1971
• Nils Olav Fjeldheim (born 1977 in Tysværvåg), sprint and marathon canoeist who was a bronze medallist in the 2004 Summer Olympics
• Peder Losnegård (born 1992 in Tysvær) whose stage name is Lido, a hip hop artist, rapper, producer, and songwriter

• Media related to Tysvær at Wikimedia Commons
• The dictionary definition of Tysvær at Wiktionary
• Rogaland travel guide from Wikivoyage
• Municipal fact sheet from Statistics Norway (in Norwegian)