Halden Prison is a maximum-security prison in Halden, Norway. It has three main units and has no conventional security devices. The third-largest prison in Norway, it was established in 2010 with a focus on rehabilitation; its design simulates life outside the prison. Among other activities, sports and music are available to the prisoners, who interact with the unarmed staff to create a sense of community. Praised for its humane conditions, Halden Prison has received the Arnstein Arneberg Award for its interior design in 2010 and been the subject of a documentary, but has also received criticism for being too liberal.

Halden, between 1665 and 1928 known as Fredrikshald, is both a town and a municipality in Østfold county, Norway. The municipality borders Sarpsborg to the northwest, Rakkestad to the north and Aremark to the east, as well as the Swedish municipalities Strömstad, Tanum and Dals-Ed respectively to the southwest, south and southeast.