| Official Name: | Masidar |
| Native Name: | ماسي در |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kurdistan |
| Subdivision Type2: | County |
| Subdivision Name2: | Baneh |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Alut |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Posht-e Arbaba |
| Population As Of: | 2006 |
| Population Total: | 34 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 35.9558°N 45.8428°W |
Masidar (Persian: ماسي در, also Romanized as Māsīdar and Masider; also known as Māhīdar) is a village in Posht-e Arbaba Rural District, Alut District, Baneh County, Kurdistan Province, Iran. At the 2006 census, its population was 34, in 7 families. The village is populated by Kurds.[1]