Dimnøya, also called Dimna an island in Ulstein Municipality in Møre og Romsdal county, Norway.

Dimna is connected to the neighboring island of Hareidlandet to the east by a 20-metre (66 ft) wide bridge.

The town of Ulsteinvik lies 2 kilometres (1.2 mi) northeast of the island.

It is located about 1 kilometre (0.62 mi) north of the island of Gurskøy and about 1.5 kilometres (0.93 mi) north of the island of Leinøy, both in neighboring Herøy Municipality.

This article about an island in Møre og Romsdal is a stub.