| Official Name: | Clark Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Johnson |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 34.44 |
| Area Land Sq Mi: | 34.43 |
| Area Water Sq Mi: | 0.02 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 2887 |
| Population Density Sq Mi: | 71.5 |
| Elevation Footnotes: | [2] |
| Elevation M: | 236 |
| Elevation Ft: | 774 |
| Coordinates: | 39.5847°N -85.9958°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-12781[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453201 |
Clark Township is one of nine townships in Johnson County, Indiana. As of the 2010 census, its population was 2,460 and it contained 863 housing units.[4]
Clark Township was organized in 1838.[5] It was named in honor of the Clark family of pioneer settlers.[6]
The Heck-Hasler House was listed on the National Register of Historic Places in 2000.
According to the 2010 census, the township has a total area of, of which (or 99.97%) is land and (or 0.06%) is water.[4]