| Seyyed Mahalleh | |
| Native Name: | Persian: سيد محله |
| 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: | Sari |
| Subdivision Type3: | District |
| Subdivision Name3: | Rudpey |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Rudpey-ye Gharbi |
| Unit Pref: | Metric |
| Population As Of: | 2016 |
| Population Total: | 1544 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
Seyyed Mahalleh (Persian: سيدمحله) is a village in Rudpey-ye Gharbi Rural District of Rudpey District, Sari County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 1,638 in 445 households, when it was in Rudpey-ye Jonubi Rural District of the Central District.[2] The following census in 2011 counted 1,618 people in 502 households, by which time the rural district had been separated from the district in the establishment of Rudpey District.[3] The 2016 census measured the population of the village as 1,544 people in 529 households, when it had been transferred to the new Rudpey-ye Gharbi Rural District. It was the most populous village in its rural district.[4]