| Official Name: | Tang-e Si |
| Native Name: | تنگ سي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Fars |
| Subdivision Type2: | County |
| Subdivision Name2: | Rostam |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Rostam-e Do |
| Population As Of: | 2006 |
| Population Total: | 56 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 30.3875°N 51.3219°W |
Tang-e Si (Persian: تنگ سي, also Romanized as Tang-e Sī; also known as Qal‘eh-ye Āqājān) is a village in Rostam-e Do Rural District, in the Central District of Rostam County, Fars Province, Iran. At the 2006 census, its population was 56, in 12 families.