Bærumsmarka is a forested recreational area located outside Oslo, Norway.

The area constitutes part of Oslomarka and is bordered by Krokskogen and Nordmarka.

Bærumsmarka is laced by over 70 square kilometres of marked hiking, riding and ski trails.

The area was a site of coal mining in connection with an iron network operation from the mid-1600s to the mid-1800s.

The association Bærumsmarkas Venner was formed in 1985 to preserve the area against future development.