Kawachi may refer to either of the following places in Japan:
- Kawachi Province, one of the old provinces of Japan
- Kawachi, Kumamoto, a former town in Kumamoto Prefecture
- Kawachi, Osaka, a former city in Osaka Prefecture
- Kawachi, Ibaraki, a town in Ibaraki Prefecture
- Kawachi, Ishikawa, a former village in Ishikawa Prefecture
- Kawachi, Tochigi, a former town in Tochigi Prefecture
Kawachi may also be an alternative spelling for:
- Cahuachi, a major ceremonial center of the Nazca culture in present-day Peru