Kepler Cascades, Waterfall on Firehole River, Yellowstone National Park, United States.

Kepler Cascades is a waterfall on the Firehole River about 2.5 miles south of Old Faithful in Yellowstone National Park. It drops roughly 150 feet over several steps, the longest a 50-foot fall, and is visible from the Old Faithful to West Thumb road.

The Washburn-Langford-Doane Expedition came upon the cascades on 18 September 1870, and Gustavus C. Doane described two roaring falls of 20 and 50 feet in his 1871 report to the Secretary of War. In 1881 park superintendent Philetus Norris named them for Kepler Hoyt, the 12-year-old son of Wyoming territorial governor John Wesley Hoyt, who was visiting Yellowstone that year.

The name comes from Kepler Hoyt, the 12-year-old son of Wyoming territorial governor John Wesley Hoyt, whom superintendent Philetus Norris met visiting Yellowstone in 1881. Doane's 1871 report noted the two roaring cascades were passed without a halt, overshadowed by grander sights.

The location is easily accessible right along the park's main road with a nearby parking area and short walk to viewing points. The access is straightforward and works well for visitors passing through on their way to other park destinations.

The name comes from Kepler Hoyt, the 12-year-old son of Wyoming territorial governor John Wesley Hoyt, who was touring Yellowstone in 1881 when superintendent Philetus Norris named the falls after him. The boy's first name was given to the cascades, not a surname.