Supai (Havasupai: Havasuuw) is a census-designated place (CDP) in Coconino County, Arizona, United States, within the Grand Canyon.
As of the 2010 census, the CDP had a population of 208. The capital of the Havasupai Indian Reservation, Supai is currently one of only two places in the United States where mail is still carried out by mules, the other being Phantom Ranch in the Grand Canyon.
It is the most remote community in the lower 48 states. The only way to get to it is to take a helicopter or to hike or ride a mule along the Havasupai Trail. Supai is 8 miles (13 km) from the nearest road. There are no cars in the community.