| Official Name: | Harpster, Idaho |
| Pushpin Map: | Idaho#USA |
| Pushpin Label: | Harpster |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Idaho |
| Subdivision Type2: | County |
| Subdivision Name2: | Idaho |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 1575 |
| Coordinates: | 45.9867°N -115.9636°W |
| Area Code: | 208, 986 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 397775[1] |
Harpster is an unincorporated community in Idaho County, Idaho, United States. Harpster is located along Idaho State Highway 13 northeast of Grangeville and south of Stites.
Harpster's population was 135 in 1909.[2]