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 municipality is the 231st largest by area out of the 356 municipalities in Norway. Tysvær is the 100th most populous municipality in Norway with a population of 11,283. The municipality's population density is and its population has increased by 9.3% 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.