Cadiz
- County:
- Harrison County
- County Seat:
- Yes
- Area (mi²):
- 8.784
- State:
- Ohio
Cadiz is a village located in Harrison County, Ohio. Cadiz has a 2026 population of 2,950. It is also the county seat of Harrison County. Cadiz is currently declining at a rate of -1.07% annually and its population has decreased by -3.41% since the most recent census, which recorded a population of 3,054 in 2020.