| Khesht Sar | |
| Native Name: | Persian: خشت سر |
| Native Name Lang: | fa |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mazandaran |
| Subdivision Type2: | County |
| Subdivision Name2: | Mahmudabad |
| Subdivision Type3: | District |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Ahlamerestaq-e Shomali |
| Unit Pref: | Metric |
| Population As Of: | 2016 |
| Population Total: | 2656 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Khesht Sar (Persian: خشت سر) is a village in Ahlamerestaq-e Shomali Rural District of the Central District of Mahmudabad County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 2,524 in 701 households.[2] The following census in 2011 counted 2,472 people in 775 households.[3] The 2016 census measured the population of the village as 2,656 people in 905 households. It was the most populous village in its rural district.[4]