| Kateh Shamshir-e Sofla | |
| Native Name: | Persian: كته شمشير سفلي |
| Native Name Lang: | fa |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Razavi Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Fariman |
| Subdivision Type3: | District |
| Subdivision Name3: | Qalandarabad |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Qalandarabad |
| Unit Pref: | Metric |
| Population As Of: | 2016 |
| Population Total: | 3112 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Kateh Shamshir-e Sofla (Persian: كته شمشيرسفلي) is a village in Qalandarabad Rural District of Qalandarabad District, Fariman County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 2,552 in 565 households.[2] The following census in 2011 counted 2,980 people in 745 households.[3] The 2016 census measured the population of the village as 3,112 people in 806 households. It was the most populous village in its rural district.[4]