| 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: | Decatur |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 50.72 |
| Area Land Sq Mi: | 50.65 |
| Area Water Sq Mi: | 0.06 |
| Population As Of: | 2020 |
| Population Total: | 1284 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [1] |
| Elevation M: | 253 |
| Elevation Ft: | 830 |
| Coordinates: | 39.3128°N -85.6192°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-13042[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453208 |
Clay Township is one of nine townships in Decatur County, Indiana. As of the 2020 census, its population was 1,284 (slightly down from 1,287 at 2010[3]) and it contained 523 housing units.[4]
Clay Township was organized in 1836.[5]
Champ's Ford Bridge was added to the National Register of Historic Places in 2009.
According to the 2010 census, the township has a total area of, of which (or 99.86%) is land and (or 0.12%) is water.[3]
(This list is based on USGS data and may include former settlements.)
The township contains seven cemeteries: Center Grove, Columbia, Mowery, Nauvoo, Patrick, Pumphrey and Swinney.