Estill Springs is a town in Franklin County, Tennessee, United States. The population was 2,055 at the 2010 census. It is usually referred to simply as "Estill" by its inhabitants.
Estill Springs is part of the Tullahoma, Tennessee, Micropolitan Statistical Area and is located in Middle Tennessee.
Mineral springs in the area had long been known to the Cherokee people of the region. Before they settled here, varying cultures of indigenous peoples had lived in the area for thousands of years.
The European-American town dates from circa 1840, when the Frank Estill family, which owned considerable property in the area, donated a right-of-way for railroad construction. The combination of mineral waters, which were much in vogue as a health remedy at the time, and convenient rail access caused the settlement to develop as a small-scale spa town, which took its name from the springs. Oscar Meyer was appointed the first mayor of Estill.
During the Civil War, the town was generally known as "Allisonia", for another family which had settled in the area. It was the site of a Confederate training camp, Camp Harris, named for Isham G. Harris, the Confederate governor of Tennessee, who was a native of the county.