| Official Name: | Walnut Grove, Hardin County, Tennessee |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Tennessee#USA |
| Pushpin Label: | Walnut Grove |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Tennessee |
| Subdivision Type2: | County |
| Subdivision Name2: | Hardin |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 5.756 |
| Area Land Sq Mi: | 5.756 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2020 |
| Population Total: | 359 |
| Population Density Sq Mi: | auto |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 764 |
| Coordinates: | 35.04°N -88.0511°W |
| Area Code: | 731 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1304349 |
Walnut Grove is an unincorporated community and census-designated place (CDP) in Hardin County, Tennessee. Walnut Grove is located on Tennessee State Route 69, north of the Alabama border. As of the 2020 census, its population was 359,[2] down from 396 at 2010.[3]