Cass County may refer to:
Counties in the United States
- Bartow County, Georgia, formerly called Cass County
- Cass County, Illinois
- Cass County, Indiana
- Cass County, Iowa
- Cass County, Michigan
- Cass County, Minnesota
- Cass County, Missouri
- Cass County, Nebraska
- Cass County, North Dakota
- Cass County, Texas
Other uses