Tysnes is a municipality in Hordaland county, Norway. It is located in the traditional district of Sunnhordland. The administrative centre is the village of Uggdal. Other population centres in Tysnes include the villages of Våge and Onarheim. The island municipality is located in a group of islands near the mouth of the Hardangerfjorden. The majority of the municipal population lives on the island of Tysnesøya, the largest island in the municipality.

The historic parish of Tysnæs was established as a municipality on 1 January 1838 (see formannskapsdistrikt). On 1 January 1907, the small portion of Tysnes located on the mainland (population: 67) was transferred to the neighboring municipality of Kvinnherad.

The municipality (originally the parish) are named after the old Tysnes farm (Old Norse: Týsnes), since the first Tysnes Church was built here. The first element is the genitive case of the name of the god Tyr and the last element is nes which means "headland".

This is probably the only place in Norway named after the god Tyr. It is interesting to note that several place names around the farm also have sacred meanings: Ve (holy place), Helgastein (holy rock), Godøy (the god's island), and Vevatnet (the holy lake). The old name of the big island of Tysnesøy was Njarðarlǫg (the district of the god Njord). Recently, a sun phenomenon connected to the original Tysnes headland has been discovered, and this seems to be the starting-point of the sacral name complex.

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