| Official Name: | Flat Top Mountain, Tennessee |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Tennessee#USA |
| Pushpin Label: | Flat Top Mountain |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Tennessee |
| Subdivision Type2: | County |
| Subdivision Name2: | Hamilton |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 44.87 |
| Area Land Km2: | 44.87 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 17.32 |
| Area Land Sq Mi: | 17.32 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 561 |
| Population Density Km2: | 12.50 |
| Population Density Sq Mi: | 32.38 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 1509 |
| Coordinates: | 35.3319°N -85.2003°W |
| Area Code: | 423 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2584580 |
Flat Top Mountain is a census-designated place in Hamilton County, Tennessee, United States. Its population was 561 at the 2020 census, up from 422 at the 2010 census.[3]