Hvasser is a populated island in Færder Municipality in Vestfold county, Norway.

The island sits about 25 kilometres (16 mi) south of the city of Tønsberg and about 8 kilometres (5.0 mi) northwest of the Færder Lighthouse.

There is also a harbor, restaurant, gallery, and general store on the east coast of the island along the Sandøsundet strait.

[2] Hvasser is also the pilot harbour for ships in and out the Oslo fjord.

The central part of the island is heavily populated and the area is known as the village of Hvasser.