| Official Name: | Mohammadabad |
| Native Name: | Persian: محمداباد |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Alborz |
| Subdivision Type2: | County |
| Subdivision Name2: | Nazarabad |
| Subdivision Type3: | District |
| Subdivision Name3: | Tankaman |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Tankaman-e Jonubi |
| Population As Of: | 2016 |
| Population Total: | 781 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 35.8325°N 50.6169°W |
| Coordinates Footnotes: | [1] |
| Native Name Lang: | fa |
Mohammadabad (Persian: محمداباد) is a village in Tankaman-e Jonubi Rural District of Tankaman District, Nazarabad County, Alborz province, Iran.
At the time of the 2006 National Census, the village's population was 448 in 115 households, when it was in Najmabad Rural District of Tankaman District, Tehran province.[2] The 2016 census measured the population of the village as 781 people in 232 households, by which time the county had been separated from the province in the establishment of Alborz province.[3] The rural district was transferred to the Central District, and Mohammadabad was transferred to Tankaman-e Jonubi Rural District. It was the most populous village in its rural district.[4]