| Official Name: | Portland Mills, Indiana |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Portland Mills |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Putnam |
| Subdivision Type3: | Township |
| Subdivision Name3: | Clinton |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 39.7781°N -87.0092°W |
| Elevation Ft: | 732 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46135 |
| Area Code: | 765 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 441473 |
Portland Mills is an unincorporated community in Clinton Township, Putnam County, in the U.S. state of Indiana.
A post office was established at Portland Mills in 1837, and remained in operation until it was discontinued in 1904.[1]