| Hajj Siran | |
| Native Name: | Persian: حاج سيران |
| Native Name Lang: | fa |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Zanjan |
| Subdivision Type2: | County |
| Subdivision Name2: | Zanjan |
| Subdivision Type3: | District |
| Subdivision Name3: | Qareh Poshtelu |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Qareh Poshtelu-e Pain |
| Unit Pref: | Metric |
| Population As Of: | 2016 |
| Population Total: | 321 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Hajj Siran (Persian: حاج سيران) is a village in Qareh Poshtelu-e Pain Rural District of Qareh Poshtelu District of Zanjan County, Zanjan province, Iran.
At the time of the 2006 National Census, the village's population was 383 in 83 households.[2] The following census in 2011 counted 318 people in 87 households.[3] The 2016 census measured the population of the village as 321 people in 106 households. It was the most populous village in its rural district.[4]