Clinton Township is one of nine townships in Decatur County, Indiana. As of the 2020 census, its population was 523 (up from 513 at 2010) and it contained 191 housing units.
Clinton Township was organized in 1829.
According to the 2010 census, the township has a total area of , all land.
The township contains three cemeteries: Butcher, McLaughlin and Swails.