| Official Name: | Marjanlu |
| Native Name: | مرجانلو |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | East Azerbaijan |
| Subdivision Type2: | County |
| Subdivision Name2: | Osku |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Ilkhchi |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Shurakat-e Jonubi |
| Population As Of: | 2006 |
| Population Total: | 356 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.9422°N 45.9131°W |
Marjanlu (Persian: مرجانلو, also Romanized as Marjānlū; also known as Mīrjānlū) is a village in Shurakat-e Jonubi Rural District, Ilkhchi District, Osku County, East Azerbaijan Province, Iran. At the 2006 census, its population was 356, in 84 families.