Bluff is a town in San Juan County, Utah, United States. The population was 320 at the 2000 census. Bluff incorporated in 2018.

Under the executive of John Taylor, Silas S. Smith and Danish settler Jens Nielson led just about 230 Mormons upon an expedition to start a gardening community in southeastern Utah. After forging approximately 200 miles (320 kilometers) of their own trail over hard terrain, the settlers arrived on the site of Bluff in April 1880. (The trail followed went more than and next to the “Hole in the Rock”, which now opens into one of the tributaries of Lake Powell.) The town was named for the bluffs near the town site. The town’s population had declined to seventy by 1930 but rebounded during a uranium prospecting boom in the 1950s. With the uranium subside in the 1970s, Bluff over declined and now remains a small town later about 200 residents.

Bluff is located in the sparsely populated southeastern Utah canyonlands of the Colorado Plateau. The community is on the north margin of the San Juan River valley at the confluence of Cottonwood Wash in imitation of the San Juan. U.S. routes 163 and 191 and State Route 162 pass through the community.

According to the United States Census Bureau, the town has a total Place of 22.6 square miles (58.7 km), of which 22.1 square miles (57.2 km²) is land and 0.6 square mile (1.4 km) (2.43%) is water.