| 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: | Carroll |
| Government Type: | Indiana township |
| Area Total Sq Mi: | 20.77 |
| Area Land Sq Mi: | 20.76 |
| Area Water Sq Mi: | 0.01 |
| Population As Of: | 2020 |
| Population Footnotes: | [1] |
| Population Total: | 1218 |
| Population Density Sq Mi: | auto |
| Elevation Footnotes: | [2] |
| Elevation M: | 211 |
| Elevation Ft: | 692 |
| Coordinates: | 40.4575°N -86.6328°W |
| Blank Name: | FIPS code |
| Blank Info: | 18-12988[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453205 |
Clay Township is one of fourteen townships in Carroll County, Indiana. As of the 2020 census, its population was 1,218 (down from 1,255 at 2010[4]) and it contained 475 housing units. Clay Township is part of the Rossville, Indiana school district.
Clay Township was organized in 1831.[5]
According to the 2010 census, the township has a total area of, of which (or 99.95%) is land and (or 0.05%) is water.[4] The North Fork and Middle Fork of the Wildcat Creek both pass through Clay Township. The Lancaster Bridge, an historic covered bridge erected in 1872, spans the North Fork of the Wildcat Creek east of Owasco. The North Fork is an official Indiana State Scenic River.
The township contains four cemeteries: Beard, Hufford, Hufford, Hughes and St. John's.