| Official Name: | Cass Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Clay |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 12 |
| Area Land Sq Mi: | 12 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2020 |
| Population Total: | 346 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 177 |
| Elevation Ft: | 581 |
| Coordinates: | 39.4497°N -86.9803°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-10666[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453162 |
Cass Township is one of eleven townships in Clay County, Indiana. As of the 2020 census, its population was 346 (slightly down from 347 at 2010[3]) and it contained 148 housing units.[4]
Cass Township was organized in the 1840s. It was named for Lewis Cass.[5]
The Indiana State Highway Bridge 42-11-3101 and Poland Presbyterian Church and Cemetery are listed on the National Register of Historic Places.
According to the 2010 census, the township has a total area of, all land.[3]
(This list is based on USGS data and may include former settlements.)
The township contains 13 cemeteries: Cagle, Neir, Wilkinson-Nees, Poland Chapel, [Unnamed]. Anderson, Cromwell, Rizley, Old Mace, Dyer-Schopple, Syster, Union, & Latham-Lucas.