| Official Name: | Shah Najaf |
| Native Name: | Persian: شاه نجف |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Chaharmahal and Bakhtiari |
| Subdivision Type2: | County |
| Subdivision Name2: | Falard |
| Subdivision Type3: | District |
| Subdivision Name3: | Emamzadeh Hasan |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Poshtkuh |
| Population As Of: | 2016 |
| Population Total: | 1131 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 31.3097°N 51.1219°W |
| Coordinates Footnotes: | [1] |
Shah Najaf (Persian: شاه نجف) is a village in Poshtkuh Rural District of Emamzadeh Hasan District, Falard County, Chaharmahal and Bakhtiari province, Iran, serving as capital of the district.[2]
At the time of the 2006 National Census, the village's population was 779 in 179 households, when it was in the former Falard District of Lordegan County.[3] The following census in 2011 counted 1,277 people in 305 households.[4] The 2016 census measured the population of the village as 1,131 people in 307 households. It was the most populous village in its rural district.[5]
In 2022, the district was separated from the county in the establishment of Falard County. The rural district was transferred to the new Emamzadeh Hasan District.[2]