Langfossen is a waterfall located in Etne Municipality in Vestland county, Norway. The waterfall is located about 5 kilometres (3.1 mi) southwest of the village of Fjæra. The water falls down a towering mountain, a total distance of about 612 metres (2,008 ft) before the water leaps out into Åkrafjorden at the base of the mountain. European route E134 runs along the base of the waterfall, making access very easy.

The World Waterfall Database declared this waterfall to be one of the "best in the world". In March 2011 CNN/Budget Travel sat Langfossen as one of the worlds ten most beautiful waterfalls. The waterfall is one of the few in Norway that has not been used in hydroelectric power generation, so it is still in its natural state.

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• List of waterfalls § Norway