| Qaleh Sin | |
| Native Name: | Persian: قلعه سين |
| Native Name Lang: | fa |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Tehran |
| Subdivision Type2: | County |
| Subdivision Name2: | Pishva |
| Subdivision Type3: | District |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Pishva |
| Unit Pref: | Metric |
| Elevation M: | 916 |
| Population As Of: | 2016 |
| Population Total: | 2892 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Qaleh Sin (Persian: قلعه سين) is a village in, and the capital of, Pishva Rural District of the Central District of Pishva County, Tehran province, Iran.[2]
At the time of the 2006 National Census, the village's population was 2,083 in 506 households, when it was in Asgariyeh Rural District of the former Pishva District of Varamin County.[3] The following census in 2011 counted 2,122 people in 561 households,[4] by which time the district had been separated from the county in the establishment of Pishva County. The rural district was transferred to the new Central District, and Qaleh Sin was transferred to Pishva Rural District created in the district.[2] The 2016 census measured the population of the village as 2,892 people in 811 households. It was the most populous village in its rural district.[5]