| 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: | Greene |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 18.08 |
| Area Land Sq Mi: | 17.62 |
| Area Water Sq Mi: | 0.45 |
| Area Water Percent: | 2.49 |
| Population As Of: | 2020 |
| Population Total: | 299 |
| Population Density Sq Mi: | auto |
| Elevation M: | 148 |
| Elevation Ft: | 486 |
| Coordinates: | 38.9275°N -87.0103°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0453164 |
Cass Township is one of fifteen townships in Greene County, Indiana, USA. As of the 2020 census, its population was 299,[1] down from 358 at 2010.[2]
According to the 2010 census, the township has a total area of, of which (or 97.46%) is land and (or 2.49%) is water.[2] The streams of Doans Creek, Gilbert Creek, Mud Creek and Woodhouse Branch run through this township.
The township contains three cemeteries: Gilbreath, Old Slinkard and Slinkard.