Loyston is a ghost town in Union County, Tennessee, United States, that was inundated by the waters of the Clinch River after the completion of Norris Dam in 1936. Established in the early 19th century around a foundry built by its namesake, John Loy, over subsequent decades the community's location along State Highway 61 helped it grow into a trading center for local farmers. By the time the Tennessee Valley Authority (TVA) began making plans to build Norris Dam in the early 1930s, Loyston had a population of approximately 70 residents, and consisted of a post office and several small businesses.