| Official Name: | Sadabad |
| Native Name: | سعد آباد |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Semnan |
| Subdivision Type2: | County |
| Subdivision Name2: | Shahrud |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Howmeh |
| Population As Of: | 2006 |
| Population Total: | 307 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.4033°N 55.0483°W |
Sadabad (Persian: سعد آباد, also Romanized as Sa‘dābād and Sa‘adābād; also known as Sa‘dābād Maḩalleh and Sa‘īdābād) is a village in Howmeh Rural District, in the Central District of Shahrud County, Semnan Province, Iran. At the 2006 census, its population was 307, in 96 families.