Tysvær is a municipality in Rogaland county, Norway. It is part of the region of Haugaland. The municipality is located at the northern side of Boknafjord, east of Karmøy. Tysvær has a population of 9,349 (2006) and an area of 419 km². Aksdalsvatnet is a lake in this municipality.
Local administration is located at Aksdal. Tysvær has a number of scenic walks including Heggelifjellet and Kvinnesland, the source of the name Kvindesland.Tysvær was separated from Skjold in 1849. The municipality of Nedstrand, and some parts of Skjold, Avaldsnes, Vikedal and Vats, were merged with Tysvær on 1 January 1965.
The Norwegian emigration to the United States was initiated by the local Cleng Peerson. Also, the painter Lars Hertervig and Asbjørn Kloster, leader of the Norwegian temperance movement were born in Tysvær.