Janesville is the name of several places in the United States of America:
- Janesville, California
- Janesville, Illinois
- Janesville, Iowa
- Janesville, Minnesota
- Janesville, Wisconsin
- Janesville (town), Wisconsin
- Janesville Township, Minnesota
Janesville may also refer to:
- Janesville: An American Story, a book by Amy Goldstein
See also
- Janeville, a community in Gloucester County, New Brunswick, Canada
- Jamesville (disambiguation)