Orsa Lake (Swedish: Orsasjön) is a lake in the Swedish province Dalarna. It is connected to Siljan by a 4 kilometres (2.5 mi) narrow sound, Moranoret.

Orsa Lake is 14 kilometres (8.7 mi) long and 6.5 kilometres (4.0 mi) wide. The lake has an area of 53 square kilometres (20 sq mi) and the largest depth reaches to 94 meters.

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  Where Enån meets the Orsasjön
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  General view of the lake