Granholmen is an island in the Sandefjordsfjord in Sandefjord Municipality in Vestfold county, Norway. It is located about 5 kilometres (3.1 mi) south of the city center of Sandefjord and about 2.5 kilometres (1.6 mi) to the north of the village of Hem in neighboring Larvik Municipality. The 5-hectare (12-acre) island has a campground, a cafe, kiosk, pub, and soccer field, along with grasslands and sandy beaches. It lies along county road 303 and is connected to the mainland by a bridge. A hotel was constructed on the island in 1902 when the island was purchased by Anton Johansen. He also established a restaurant at Granholmen. Ferries such as Fjeldvik, Huvik II, Laugen, Expedit, and Varden transferred visitors to the island.