| Official Name: | Ganntown, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Ganntown |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Johnson |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 548 |
| Coordinates: | 37.3633°N -88.7842°W |
| Area Code: | 618 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 408870 |
Ganntown is an unincorporated community in Johnson County, Illinois, United States. The community is located along County Route 10 east-southeast of Vienna.[1]