| Official Name: | Waterloo, Missouri |
| Pushpin Map: | Missouri#USA |
| Pushpin Label: | Waterloo |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Lafayette |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 702 |
| Coordinates: | 39.1331°N -94.0344°W |
| Area Code: | 660 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 728406 |
Waterloo is a community in Lafayette County, Missouri, United States. The community is located in west central Missouri on MO 224, near the south bank of the Missouri River. Nearby towns include Napoleon, Wellington, and Lexington.
Waterloo was laid out in 1905.[1] The community was named in commemoration of the Battle of Waterloo, at which Napoleon surrendered.[2] A post office called Waterloo was established in 1877, and remained in operation until 1909.[3]