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Tretten

Tretten is a parish and a small village in the northern part of the Øyer municipality, Norway.

Its population is 880. Tretten is located on the Losna lake, which is part of the Gudbrandsdalslågen river. The village had its own sports team Tretten IL until 1990, when a merger created Øyer-Tretten IF.

Tretten was also the location of the biggest train disaster in Norway's history. The Tretten train disaster occurred on 22 February 1975 when two passenger trains collided head on. 27 people were killed in the accident.