| Official Name: | Pleasant Mills, Indiana |
| Settlement Type: | Unincorporated community and Census-designated place |
| Mapsize: | 120px |
| Pushpin Map: | USA Indiana Adams County |
| Pushpin Label: | Pleasant Mills |
| Pushpin Map Caption: | Location in Adams County |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Adams |
| Subdivision Type3: | Township |
| Subdivision Name3: | St. Marys |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 40.7767°N -84.8417°W |
| Elevation Ft: | 797 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46733 |
| Blank Name: | FIPS code |
| Blank Info: | 18-60552[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2830298 |
Pleasant Mills is an unincorporated community in St. Marys Township, Adams County, in the U.S. state of Indiana.
A post office was established at Pleasant Mills in 1850.[2] Edward G. Coxen was named the Pleasant Mills Postmaster on January 16, 1850. It was named from its tranquil setting near a gristmill.[3]
Pleasant Mills appeared as a separately-returned community in the U.S. Census twice, both times in the nineteenth century. Its highest officially-recorded population was 80 inhabitants in 1870.