Urriðafoss is a waterfall in River Þjórsá. The waterfall has been quite a concern in recent years with the planning of a dam for a power station further inland. Concerns have also been raised about the future of the salmon run in River Þjórsá.

With the growing numbers of tourists in Iceland, Urriðafoss has become quite an attraction in the last few years.  The waterfall is easily accessible from the main road, Road 1, about ten minute drive east from Selfoss.