Clinton Township is one of fourteen townships in Cass County, Indiana, United States. As of the 2020 census, its population was 646 (down from 816 at 2010) and contained 226 housing units.
Clinton Township was organized in 1834. It was named for DeWitt Clinton, sixth Governor of New York.
According to the 2010 census, the township has a total area of , of which (or 98.49%) is land and (or 1.51%) is water.
The township contains four cemeteries: Clymers, Porter, Saint Johns and Shideler.