Thorsø or Tose is a farm located in the former municipality of Torsnes (until 1910 part of Borge) in Østfold county, Norway.

[1][2] Jan de Vries pointed out in his work on Germanic religion that although instances of placenames derived from Þórshof are fairly common in Norway, they are all grouped around the Oslofjord.

[4] Archaeological discoveries on the farm indicate that settlement there dates back to ancient times and include stone axes and two 12th-century runestones.

Under Oluf Kalips it became an aristocratic estate, and it has since belonged to the Rosenvinge, Bildt, Budde, Sehested and Stang families.

[4] Prominent owners of the Thorsø estate have included war minister Hans Angell Gude, who disappeared from the house mysteriously in the autumn of 1814, thought to have been murdered,[4][5] and the Norwegian politician and agronomist Kai Møller.