Tuba City (Navajo: Tó Naneesdizí) is an unincorporated town and census-designated place in Coconino County, Arizona, on the Navajo Nation, United States. It is the second-largest community in Coconino County. The population of the census-designated place (CDP) was 8,611 at the 2010 census.

It is the most populous community within the Navajo Nation, and the site of the headquarters of the Western Navajo Agency. The Hopi village of Moenkopi lies directly to its southeast. A Hopi minority also live in Tuba City; the majority are Navajo.

European Americans associated with The Church of Jesus Christ of Latter-day Saints named the town in honor of chief Tuuvi, a Hopi man from Oraibi. He converted to the Mormon faith and allowed their migrants to settle in this area.

The Navajo name for this community, Tó Naneesdizí, translates as "tangled waters". It likely refers to the many below-ground springs that are the source of several reservoirs.

Tuba City is located within the Painted Desert near the western edge of the Navajo Nation. Tuba City is located approximately 50 miles (80 km) from the eastern entrance to Grand Canyon National Park and approximately 78 miles (126 km) from Flagstaff.

The Tuba City area was the territory of indigenous peoples for thousands of years. The community was first documented by Spanish explorers: Father Francisco Garcés visited the area in 1776, and recorded that the Hopi were cultivating crops.

European-American migrants came as part of the Mormon movement to the West in the late 19th century. They named the town after Tuuvi, a Hopi man who converted to Mormonism circa 1870. He had invited the Mormons to settle near his village of Moenkopi without requiring them to gain individual permission.

The Tuba City Trading Post was established in 1870. It dealt with the Navajo and Paiute who came to the area for the natural springs, as well as the Hopi already in the area. European-American Mormon emigrants claimed to found Tuba City in 1872.