Tonsenhagen is a neighborhood in the borough of Bjerke in northeast Oslo, Norway. Built in the 1950s, it was one of the early new suburbs within Oslo. The neighborhood is situated on a hillside overlooking Oslo and the Grorud Valley, surrounded by forest and near the ski resort of Grefsenkollen. There is a local school, for which the first headmaster was , and the Norwegian children's play and book writer Ingebrigt Davik was once a teacher there.