Cass Township is one of seventeen townships in Cedar County, Iowa, United States. As of the 2000 census, its population was 295.
The first settler in Cass Township was William Kester, who arrived about 1837.
Cass Township covers an area of and contains no incorporated settlements. According to the USGS, it contains four cemeteries: Cass, Evergreen, Mathews and Shawver.