Maynardville is a city in and the county seat of Union County, Tennessee, United States. Its population was 1,782 at the 2000 census. It is included in the Knoxville, Tennessee Metropolitan Statistical Area.
Maynardville was the birthplace of country music singers Roy Acuff and Carl Smith.
What is now Maynardville began in the early 19th century as a small community known as Liberty. When Union County was created in the 1850s, Liberty, being nearest the center of the county, was chosen as the county seat. The land for the courthouse square was donated by Marcus Monroe (1793–1870), a local minister.