Valderøya or Valderøy[1] is an island off the west coast of Norway.

It is part of Giske Municipality in Møre og Romsdal county.

Valderøya is also connected to the island Vigra to the north by a short bridge.

[2] The municipal administration, a dentist, and a healthcare service centre for children are found in the municipal hall at Valderhaugstrand, a village on the south side of the island.

Nordstrand and Oksnes are two other small villages on the north-east side of the island.