Thorufoss (Þórufoss) is an 18 m (62 ft) high waterfall found east of Lake Þingvallavatn.

The waterfall makes up part of the 25 km (16 mi) river Laxá í Kjós which renowned for its healthy population of Atlantic salmon. The waterfall is less famous than its counterparts around the country and thus is not overly signposted.

Þórufoss is known to freeze over in the winter time. The waterfall was also used as a shooting location for HBO’s Game of Thrones as the home of the Children of the Forest.