| Official Name: | Unionville, Ohio |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Ashtabula, Lake |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 742 |
| Coordinates: | 41.7803°N -81.0028°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 44088 |
| Area Code: | 440 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1065411 |
Unionville is an unincorporated community on the line between northwestern Harpersfield Township in Ashtabula County and eastern Madison Township in Lake County, in the U.S. state of Ohio. It has a post office with the ZIP code 44088.[1] It lies along State Route 84.
The community's location where two counties meet caused the name "Union" to be selected.[2] Unionville is the site of the land office of the Connecticut Western Reserve; it is listed on the National Register of Historic Places.[3]