| Official Name: | Ganj-e Besiar |
| Native Name: | گنج بسيار |
| Settlement Type: | village |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kohgiluyeh and Boyer-Ahmad |
| Subdivision Type2: | County |
| Subdivision Name2: | Boyer-Ahmad |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Margown |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Margown |
| Population As Of: | 2006 |
| Population Total: | 53 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
Ganj-e Besiar (Persian: گنج بسيار, also Romanized as Ganj-e Besīār) is a village in Margown Rural District, Margown District, Boyer-Ahmad County, Kohgiluyeh and Boyer-Ahmad Province, Iran. At the 2006 census, its population was 53, in 10 families.