| Official Name: | Walnut Grove, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Walnut Grove |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | McDonough |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 709 |
| Coordinates: | 40.6161°N -90.5592°W |
| Area Code: | 309 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 423283 |
Walnut Grove is an unincorporated community in McDonough County, Illinois, United States. Walnut Grove Township was first settled in 1830. The town of Walnut Grove was "laid out" in 1870. It was originally created on a railroad line that passed through the area, however this railroad line no longer exists.[1]