| Official Name: | Byhalia, Ohio |
| Settlement Type: | Unincorporated community |
| Mapsize: | 250px |
| Pushpin Map: | Ohio |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Union |
| Unit Pref: | Imperial |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 1030 |
| Coordinates: | 40.4536°N -83.4556°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 43358 |
| Area Code: | 937, 326 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1048573 |
Byhalia is an unincorporated community in Washington Township, Union County, Ohio, United States. It is located the intersection of State Routes 31 and 739.[1]
The Byhalia Post office was established on February 16, 1852. As of 1877, the community contained one store, one physician, and one sawmill.[2] The post office was discontinued on February 14, 1906. The mail service is now sent through the Richwood branch.