| Official Name: | Waterloo Township, Athens County, Ohio |
| Settlement Type: | Township |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Athens |
| Unit Pref: | Imperial |
| Area Total Km2: | 98.2 |
| Area Land Km2: | 97.7 |
| Area Water Km2: | 0.5 |
| Population As Of: | 2020 |
| Population Total: | 2352 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Footnotes: | [1] |
| Elevation M: | 246 |
| Elevation Ft: | 807 |
| Coordinates: | 39.3394°N -82.2322°W |
| Blank Name: | FIPS code |
| Blank Info: | 39-81777[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1085760 |
Waterloo Township is one of the fourteen townships of Athens County, Ohio, United States. The 2020 census found 2,352 people in the township.[3]
Located in the western part of the county, it borders the following townships:
No municipalities are located in Waterloo Township, although three unincorporated communities lie in the township: New Marshfield in the center, Carbondale in the township's northwest, and Mineral in the west-center of the township.
Waterloo Township was organized in 1826. Its name commemorates the Battle of Waterloo.[4]
It is the only Waterloo Township statewide.[5]
The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1. Two are elected in the year after the presidential election and one is elected in the year before it. There is also an elected township fiscal officer,[6] who serves a four-year term beginning on April 1 of the year after the election, which is held in November of the year before the presidential election. Vacancies in the fiscal officership or on the board of trustees are filled by the remaining trustees.
Waterloo Township includes the entirety of the Waterloo Wildlife Research Station, the Waterloo State Forest, and a significant portion of the Zaleski State Forest. The Moonville Rail-Trail originates in Mineral within the township. Points of interest in the township include "Devils Tea-Table", a geological pillar formation on private land; the King Switch Tunnel, a timber tunnel on the Moonville Rail-Trail; a small natural bridge on Biddyville Road; and the county's largest beaver pond, also on Biddyville Road.