| Official Name: | Dayu |
| Native Name: | دايو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Bushehr |
| Subdivision Type2: | County |
| Subdivision Name2: | Jam |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Jam |
| Population As Of: | 2006 |
| Population Total: | 124 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 27.8419°N 52.2767°W |
Dayu (Persian: دايو, also Romanized as Dāyū; also known as Dāyo) is a village in Jam Rural District, in the Central District of Jam County, Bushehr Province, Iran. At the 2006 census, its population was 124, in 20 families.