Seimsdalen is a valley in Årdal Municipality in Vestland county, Norway. The valley is located 3 kilometres (1.9 mi) west of the municipal center of Årdalstangen, to which it is connected via a 1.5 kilometres (0.93 mi) long Seimsdalstunnelen [no]. The village of Indre Offerdal lies about 10 kilometres (6.2 mi) to the southwest. The population of the valley is 467 (2013).

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Aerial view of Seimsdal, Seimsdal Kraft AS, 26 September 2010