Marka is the name of the forested and hilly areas surrounding Oslo, Norway.

It includes areas within the municipality of Oslo, but also large areas in Hole, Ringerike in Buskerud county and Jevnaker, Lunner, Nittedal, Bærum, Asker, and other municipalities in Akershus county.

Despite being used frequently by many inhabitants of Oslo, especially at weekends, the fauna of marka includes species such as lynx, wolf, beaver, moose and roe deer.

The population and agricultural areas of Marka are located mainly in two valleys, Sørkedalen and Maridalen.

Oslomarka is further divided into: Of these, Vestmarka, Kjekstadmarka, Romeriksåsene, Follomarka and Sørmarka lie almost entirely outside the city limits.