Bogstadvannet is a lake between the city of Oslo and the municipality of Bærum, Akershus, Norway. It is part of Sørkedalsvassdraget, which in turn is part of Oslomarkvassdraget.Originally, the lake was named Få(d)vannet after an earlier name for Lysakerelven, but has since taken the name of the Bogstad estate and manor, on the east shore of the lake.