Clay Township is one of nine townships in Hamilton County, Indiana, United States. As of the 2010 census, its population was 83,293 and it contained 32,375 housing units. Since the annexation of Home Place, Indiana, Carmel is now completely coterminous with the township.

Clay Township was organized in 1833.

Micah Newby House was listed on the National Register of Historic Places in 1986.

According to the 2010 census, the township has a total area of 50.18 square miles (130.0 km), of which 49.09 square miles (127.1 km) (or 97.83%) is land and 1.09 square miles (2.8 km) (or 2.17%) is water. The streams of Almond Ditch, Ams Run, Blue Woods Creek, Boone Creek, Center Creek, Clay Creek, Cool Creek, Elliot Creek, Lily Vestal Drain, Henley Creek, Highway Run, Hot Lick Creek, Kirkendall Creek, Lion Creek, Little Cool Creek, Long Branch, Mitchener Ditch, Spring Mill Run, Well Run, Will Creek, and Witt Creek run through this township.

• Carmel

• Washington Township (north)
• Noblesville Township (northeast)
• Delaware Township (east)
• Washington Township, Marion County (south)
• Pike Township, Marion County (southwest)
• Eagle Township, Boone County (west)
• Union Township, Boone County (northwest)

The township contains six cemeteries: Calvary, Carmel, Farley, Pleasant Grove, Poplar Ridge, and White Chapel.

• Interstate 465
• U.S. Route 31
• U.S. Route 421
• State Road 234
• State Road 431

• "Clay Township, Hamilton County, Indiana". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved September 24, 2009.
• United States Census Bureau cartographic boundary files

• Indiana Township Association
• United Township Association of Indiana