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.

[3] According to the 2010 census, the township has a total area of 18.54 square miles (48.0 km2), all land.

[4] (This list is based on USGS data and may include former settlements.)

The township contains Downey Cemetery.