Gullfoss ("Golden Falls";  Icelandic pronunciation ) is a waterfall located in the canyon of the Hvítá river in southwest Iceland.

Gullfoss is one of the most popular tourist attractions in Iceland. The wide Hvítá rushes southward, and about a kilometre above the falls it turns sharply to the right and flows down into a wide curved three-step "staircase" and then abruptly plunges in two stages (11 m and 21 m) into a crevice 32 m (105 ft) deep. The crevice, about 20 m (66 ft) wide, and 2.5 km in length, extends perpendicular to the flow of the river. The average amount of water running down the waterfall is 140 m³/s in the summer and 80 m³/s in the winter. The highest flood measured was 2000 m³/s.