| Official Name: | Arpa Chai |
| Native Name: | ارپاچايي |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ardabil |
| Subdivision Type2: | County |
| Subdivision Name2: | Kowsar |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Sanjabad-e Shomali |
| Population As Of: | 2006 |
| Population Total: | 221 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 37.8644°N 48.5411°W |
Arpa Chai (Persian: ارپاچايي, also Romanized as Ārpā Chā’ī and Ārpā Chāy) is a village in Sanjabad-e Shomali Rural District, in the Central District of Kowsar County, Ardabil Province, Iran. At the 2006 census, its population was 221, in 34 families.