| Official Name: | Greendale, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Greendale |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Clay, Marion |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 522 |
| Coordinates: | 38.6297°N -88.6978°W |
| Area Code: | 618 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 422755 |
Greendale is an unincorporated community in Clay and Marion counties, Illinois, United States. Greendale is located on U.S. Route 50 west of Xenia and east of Iuka.