Cass Township is one of twelve townships in Dubois County, Indiana. As of the 2010 census, its population was 2,115 and it contained 873 housing units.

Cass Township was created from land given by Patoka Township.

According to the 2010 census, the township has a total area of 38.87 square miles (100.7 km), of which 38.54 square miles (99.8 km) (or 99.15%) is land and 0.33 square miles (0.85 km) (or 0.85%) is water.

• Holland

• Johnsburg
• Saint Henry
• Zoar

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

• Patoka Township (north)
• Ferdinand Township (east)
• Carter Township, Spencer County (southeast)
• Pigeon Township, Warrick County (southwest)
• Lockhart Township, Pike County (west)

• U.S. Route 231
• Indiana State Road 161

The township contains eleven cemeteries: Augustana, Holland Methodist, Mount Vernon, Mount Zion, Saint Henry, Saint James (East and West), Saint Paul United Church of Christ, Stone Family Cemetery, Wibbeler Family Cemetery, Zoar Methodist (partially in Pike County).

• "Cass Township, Dubois County, Indiana". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved September 24, 2009.
• United States Census Bureau cartographic boundary files

• Indiana Township Association
• United Township Association of Indiana