| Official Name: | Waltham, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Waltham |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | LaSalle |
| Subdivision Type3: | Township |
| Subdivision Name3: | Waltham |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 692 |
| Coordinates: | 41.4333°N -89.0103°W |
| Area Code: | 815 & 779 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 423284 |
Waltham is an unincorporated community located on E. 8th Road in Waltham Township in LaSalle County, Illinois, United States, approximately six miles north of Utica. It contains a church and several homes.