Lewis Falls, Waterfall at Lewis River in Yellowstone National Park, United States

Lewis Falls is a waterfall on the Lewis River in Yellowstone National Park where water drops over a series of rocky ledges. The cascade flows down in stages and creates a natural water display visible from the main park road.

The sources record no naming history for Lewis Falls and no link to Meriwether Lewis's expedition. The falls lie on the Lewis River, just south of Lewis Lake, in the southern part of Yellowstone National Park, and are visible from the road halfway between the park's south entrance and Grant Village.

The falls take their name from the Lewis River, which in turn honours Meriwether Lewis of the Lewis and Clark Expedition. Because the cascade sits right beside the park road between the south entrance and Grant Village, travellers can stop and view it without leaving their vehicles.

This waterfall sits between the south park entrance and Grant Village with several parking areas for visitors. The short walk to the viewpoint is easy to navigate and offers multiple spots to stop and look around.

The falls sit just south of Lewis Lake, and the drop is about 30 feet (9.1 m). Because the road passes directly beside the river here, the cascade can be seen from a vehicle without leaving the pavement, halfway between the south entrance and Grant Village.