| Official Name: | Waterloo, Indiana |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Waterloo |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Fayette |
| Subdivision Type3: | Township |
| Subdivision Name3: | Waterloo |
| Coordinates: | 39.7036°N -85.1031°W |
| Elevation Ft: | 869 |
| Postal Code Type: | ZIP code |
| Postal Code: | 47331 |
| Blank Name: | FIPS code |
| Blank Info: | 18-81296[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 445541 |
Waterloo is an unincorporated community in Waterloo Township, Fayette county, Indiana, United States.
Waterloo was platted in 1841.[2] It took its name from Waterloo Township.[3]
On May 14, 1883, a tornado struck the town, destroying all but three buildings, injuring one, and leaving 75 people homeless.[4] On April 25, 1961, an F4 tornado hit the town, destroying multiple homes and buildings, but fortunately causing no casualties in the town.[5]