| Official Name: | Mohammadabad |
| Native Name: | محمداباد |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | North Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Shirvan |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Ziarat |
| Population As Of: | 2006 |
| Population Total: | 134 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.4728°N 57.9661°W |
Mohammadabad (Persian: محمداباد, also Romanized as Moḩammadābād; also known as Moḩammad ‘Alī Khān (Persian: محمدعليخان), Qal‘eh-ye Moḩammad, and Qal‘eh-ye Moḩammad ‘Alī Khān) is a village in Ziarat Rural District, in the Central District of Shirvan County, North Khorasan Province, Iran. At the 2006 census, its population was 134, in 35 families.