Cass Township is one of seventeen townships in Boone County, Iowa, United States.

It is named for Lewis Cass.

[3] Cass Township covers an area of 18.36 square miles (47.6 km2) and contains no incorporated settlements.

According to the USGS, it contains two cemeteries: Liberty and State Hospital.

This article about the geography of Boone County, Iowa is a stub.