| Official Name: | Achuni |
| Native Name: | اچوني |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Qaen |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Mahyar |
| Population As Of: | 2006 |
| Population Total: | 63 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.9725°N 59.2872°W |
Achuni (Persian: اچوني, also Romanized as Achūnī; also known as Āchānī) is a village in Mahyar Rural District, in the Central District of Qaen County, South Khorasan Province, Iran. At the 2006 census, its population was 63, in 19 families.