| Official Name: | Fairfield, Tennessee |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Tennessee |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Tennessee |
| Subdivision Type2: | County |
| Subdivision Name2: | Sumner |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.991 |
| Area Land Sq Mi: | 0.991 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2020 |
| Population Total: | 141 |
| Population Density Sq Mi: | auto |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 810 |
| Coordinates: | 36.6197°N -86.3456°W |
| Area Code: | 615 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1315035 |
Fairfield is a census-designated place and unincorporated community in Sumner County, Tennessee, United States. As of the 2020 census, its population was 141,[2] up from 131 at the 2010 census.[3]