Asmaløy is an island in Hvaler municipality of Østfold county, Norway.
Asmaløy is one of the larger islands in the archipelago of Hvaler which consists of over 800 islands, islets, skerries and reefs located in the outer Oslofjord.
Hvaler tunnel (Norwegian: Hvalertunnelen) joins Asmaløy with Kirkeøy, the largest island in the municipality and the site of the administrative centre at Skjærhalden.
[1] Vikerhavn is a small fishing harbour and village on the southern part of the island.
The author Johan Borgen lived on Asmaløy for many years at a site known as Knatten.