| Official Name: | Grass Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Spencer |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 45.69 |
| Area Land Sq Mi: | 45.36 |
| Area Water Sq Mi: | 0.33 |
| Population As Of: | 2020 |
| Population Total: | 1113 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 138 |
| Elevation Ft: | 453 |
| Coordinates: | 38.0022°N -88°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-28944[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453338 |
Grass Township is one of nine townships in Spencer County, Indiana. As of the 2020 census, its population was 1,113 and it contained 514 housing units.[3] Grass Township contains the city of Chrisney.
Grass Township was founded about 1816, and named for Daniel Grass.[4] Daniel Grass was one of the first pioneer settlers in the area.[5]
According to the 2010 census, the township has a total area of, of which (or 99.28%) is land and (or 0.72%) is water.[6]