| Official Name: | Clay Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Cass |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 20.11 |
| Area Land Sq Mi: | 19.93 |
| Area Water Sq Mi: | 0.18 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 2842 |
| Population Density Sq Mi: | 141.4 |
| Elevation Footnotes: | [2] |
| Elevation M: | 222 |
| Elevation Ft: | 728 |
| Coordinates: | 40.8011°N -86.3006°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-13006[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453206 |
Clay Township is one of fourteen townships in Cass County, Indiana, United States, and one of the seventeen townships sharing the name in the state. As of the 2020 census, its population was 2,842 (up from 2,817 at 2010[4]) and it contained 1,177 housing units.
Clay Township was organized in 1832.[5] It was named for Henry Clay, three-term Speaker of the House of Representatives and Secretary of State.[6]
Thompson Barnett House was listed on the National Register of Historic Places in 1986.
According to the 2010 census, the township has a total area of, of which (or 99.10%) is land and (or 0.90%) is water.[4]
The township contains two cemeteries: Bethel and Wilson.