Spålen–Katnosa Nature Reserve

Spålen–Katnosa Nature Reserve is a nature reserve in Nordmarka, Norway.

It was established in 1995 and encompasses portions of the municipalities Lunner and Jevnaker in Akershus and of Ringerike in Buskerud. The area is characterised by forested hills dominated by spruce. The reserve covers an area of 18 km2 principally of woods and wetlands, including lake Katnosa.