| Official Name: | Farmington, Indiana |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Farmington |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Rush |
| Subdivision Type3: | Township |
| Subdivision Name3: | Union |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 39.6181°N -85.3589°W |
| Elevation Ft: | 1050 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46173 |
| Area Code: | 765 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 434407 |
Farmington is an unincorporated community in Union Township, Rush County, in the U.S. state of Indiana.
Farmington was originally called Marcellus, and under the latter name was laid out in 1836.[1] A post office was established under the name Farmington in 1846, and it remained in operation until it was discontinued in 1858.[2]