Mariholtet is a tourist cabin in Østmarka, which is a forested area on the eastern side of Oslo, Norway. The cabin is located on the west side of Nord-Elvåga Lake on the border between Oslo and Lørenskog municipalities. Mariholtet was originally part of the Ellingsrud fard, but was purchased by Aker municipality in 1917. The lands around Nord-Elvåga Lake were also purchased by Aker, so that the lake could be used as a drinking water source.