| Official Name: | Harper |
| Other Name: | Bigrest |
| Settlement Type: | Unincorporated Community |
| Pushpin Map: | Indiana#USA |
| Pushpin Map Caption: | Location in Indiana##Location in the United States |
| Pushpin Label Position: | right |
| Pushpin Relief: | 1 |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Type3: | Township |
| Subdivision Name1: | Indiana |
| Subdivision Name2: | Decatur |
| Subdivision Name3: | Sandcreek |
| Coordinates: | 39.1467°N -85.5936°W |
| Elevation Ft: | 781 |
| Population Density Km2: | auto |
| Timezone1: | Eastern Time |
| Utc Offset: | -5 |
| Timezone Dst: | Eastern Daylight Time |
| Utc Offset Dst: | -4 |
| Area Code: | 812 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 435761 |
Harper is an unincorporated community in Decatur County, Indiana, in the United States. It was also called Bigrest.
The first post office, called Bigrest, opened in 1881.[1] Renamed Harper in 1882, the post office was discontinued in 1907.[2]