| Official Name: | Yalanchi |
| Native Name: | يالانچي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | North Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Maneh and Samalqan |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Maneh |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Atrak |
| Population As Of: | 2006 |
| Population Total: | 212 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.7458°N 57.1581°W |
Yalanchi (Persian: يالانچي, also Romanized as Yālānchī; also known as Shīrīn Darreh and Yātānchī) is a village in Atrak Rural District, Maneh District, Maneh and Samalqan County, North Khorasan Province, Iran. At the 2006 census, its population was 212, in 57 families.