Osensjøen or Ossjøen is a lake in the municipalities of Åmot and Trysil in Innlandet County, Norway. The  lake has its outlet through Søre Osa to the Renaelva river which continues on to the large river Glomma.
Osensjøen or Ossjøen is a lake located in the municipalities of Åmot and Trysil within Innlandet County, Norway. The lake drains into the Renaelva river via Søre Osa, which flows into the larger Glomma river.