| Official Name: | Pahnai |
| Native Name: | پهنايي |
| 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: | Qaen |
| Population As Of: | 2006 |
| Population Total: | 1,776 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.6486°N 59.1258°W |
Pahnai (Persian: پهنايي, also Romanized as Pahnā’ī; also known as Pānāi and Pānāy) is a village in Qaen Rural District, in the Central District of Qaen County, South Khorasan Province, Iran. At the 2006 census, its population was 1,776, in 465 families.