Grand Falls, Tiered waterfall in Painted Desert, Arizona.

Grand Falls is a waterfall on the Little Colorado River in the Painted Desert on the Navajo Nation, about 30 miles northeast of Flagstaff. It drops 56 metres, more than Niagara Falls, over broad horizontal steps of light banded sandstone. The water is thick and opaque tan to ochre with sediment, fanning out over a lower ledge into a churning pool of the same colour.

The formation was created when lava from Merriam Crater in the San Francisco volcanic field built a natural dam, forcing the river to carve a new path. This geological event shaped the falls into their current form within the desert landscape.

The falls lie on Navajo Nation land, where the indigenous community maintains stewardship over the area and surrounding territory in the Painted Desert. Visitors should respect Navajo cultural rules and traditions when entering the site.

The falls are 30 miles (48 km) northeast of Flagstaff on the Navajo Nation, reached by the unpaved Grand Falls Road, which crosses the Little Colorado riverbed and at times needs a four-wheel-drive vehicle. A passenger car can reach the south side of the river; only Navajo guides or experienced back-country drivers should cross. The site has been closed since March 2023 for the safety of the local environment, and leaving the roads or trails is against Navajo law.

The falls are also called Chocolate Falls because the water shows a rich brown color from river sediment. This coloring remains visible throughout the flow season and sets the formation apart from other waterfalls.