Malmøya is an island 3 kilometres (1.9 mi) outside Oslo, the capital of Norway. The island is mostly known for its large quantities of fossils from the Cambro-Silurian period and its rare flowers.
Parts of Malmøya are included in the Malmøya og Malmøykalven Nature Reserve, along with the neighbour island Malmøykalven.
Coordinates: 59°52′N 10°45′E / 59.867°N 10.750°E