Cass Township is one of four townships in Ohio County, Indiana, United States. As of the 2020 census, its population was 694 and it contained 311 housing units.
Cass Township was organized in 1845.
According to the 2010 census, the township has a total area of , all land.
(This list is based on USGS data and may include former settlements.)
The township contains Downey Cemetery.