| Official Name: | Farmer, Ohio |
| Settlement Type: | Unincorporated community |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Defiance |
| Unit Pref: | Imperial |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 748 |
| Coordinates: | 41.3831°N -84.6306°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 43520 |
| Area Code: | 419 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1064639 |
Farmer is an unincorporated community in central Farmer Township, Defiance County, Ohio, United States. It has a post office with the ZIP code 43520.[1] It is located at the intersection of State Routes 2 and 249.
Farmer was named for Nathaniel Farmer, an early settler.[2]