| Official Name: | Royal Blue, Tennessee |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Tennessee#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Tennessee |
| Subdivision Type2: | County |
| Subdivision Name2: | Campbell |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 1480 |
| Coordinates: | 36.3822°N -84.2606°W |
| Area Code: | 423 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1300211 |
Royal Blue is an unincorporated community in Campbell County, Tennessee, United States. The community is along Tennessee State Route 63 near its junction with Interstate 75, north-northwest of downtown Caryville.[1]
The Blue Diamond Coal Company operated the coal mine at Royal Blue for years. During that time miners and their families were housed in small single-family homes with running water and outdoor toilets. The only commercial service available to the miners was a company store where the workers could use scrip to make purchases. Few owned cars and the only other way to travel was by a bus which transported miners from other areas in the morning and returned them in the evening.
For years school for students in grades primary through 5th grade was held in a 3-room house. c1947 a cinder block school which included indoor bathrooms was built for students through 8th grade.
Baptist and Holiness congregations shared the 3-room school for their services.