Big Spring Union Church, also known as Big Springs Primitive Baptist Church, is a historic church in Springdale, Claiborne County, Tennessee.The church was built circa 1795 or 1796, and was known at first as Big Spring Meetinghouse. A Baptist church was organized at the site in 1800. During the Civil War, it served as a hospital for both Confederate and Union Army troops.It is one of the oldest church buildings in Tennessee that is still in active use as a church.