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.

[citation needed] 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.

Below the falls, the river passes through a gorge which is part of the Jökulsárgljúfur National Park.

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