| Official Name: | Waterloo Township, Allamakee County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Allamakee |
| Area Total Km2: | 77.87 |
| Area Land Km2: | 77.87 |
| Area Water Km2: | 0 |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 30.07 |
| Area Land Sq Mi: | 30.07 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2010 |
| Population Total: | 266 |
| Population Density Km2: | 3.4 |
| Population Density Sq Mi: | 8.8 |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 329 |
| Elevation Ft: | 1079 |
| Coordinates: | 43.4681°N -91.545°W |
| Blank Name: | FIPS code |
| Blank Info: | 19-94596[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0468950 |
Waterloo Township is one of eighteen townships in Allamakee County, Iowa, USA. At the 2010 census, its population was 266.[3]
Waterloo Township was organized in 1856.[4]
Waterloo Township covers an area of 30.07sqmi and contains no incorporated settlements. It contains the unincorporated community of Dorchester. According to the USGS, it contains four cemeteries: Saint Johns, Saint Marys, Waterloo Ridge and West Waterloo Ridge.