Clay Township is one of fourteen townships in Miami County, Indiana, United States. As of the 2020 census, its population was 889 (down from 844 at 2010) and it contained 354 housing units.
Clay Township was organized in 1846. It is named for statesman Henry Clay of Kentucky.
According to the 2010 census, the township has a total area of , of which (or 99.92%) is land and (or 0.08%) is water.
The township contains Climer Cemetery.