| Official Name: | Old Saint Louis |
| Mapsize: | 120px |
| Pushpin Map: | USA Indiana Bartholomew County |
| Pushpin Label: | Old Saint Louis |
| Pushpin Map Caption: | Location in Bartholomew County |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Bartholomew |
| Subdivision Type3: | Township |
| Subdivision Name3: | Haw Creek |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 39.3206°N -85.7856°W |
| Elevation Ft: | 725 |
| Postal Code Type: | ZIP code |
| Postal Code: | 47246 |
| Blank Name: | FIPS code |
| Blank Info: | 18-56376[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 440590 |
Old Saint Louis is an unincorporated community in Haw Creek Township, Bartholomew County, in the U.S. state of Indiana.
Old Saint Louis was founded in 1836.[2]