Selfoss (Icelandic pronunciation: [ˈsɛlˌfɔsː] ) is a waterfall on the river Jökulsá á Fjöllum in the north of Iceland. The river drops over a number of waterfalls over about 30 km before flowing into Öxarfjörður, a bay of the Arctic Sea. The river originates as melt water from the glacier Vatnajökull and therefore the water flow varies depending on the season, the weather and volcanic activity.

A few hundred meters downstream of the 11 m (36 ft)-high waterfall is Dettifoss, the second-most powerful waterfall in Europe. Below the falls, the river passes through a gorge which is part of the Jökulsárgljúfur National Park.

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• Waterfalls of Iceland
• List of waterfalls

• "Selfoss". World Waterfall Database.

65°47′54″N 16°22′57″W / 65.79833°N 16.38250°W / 65.79833; -16.38250