| Official Name: | Ilderjin |
| Native Name: | ايلدرجين |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Qazvin |
| Subdivision Type2: | County |
| Subdivision Name2: | Avaj |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Abgarm |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Kharaqan-e Sharqi |
| Population As Of: | 2006 |
| Population Total: | 159 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 35.7072°N 49.3783°W |
Ilderjin (Persian: ايلدرجين, also Romanized as Īlderjīn, Īldarchīn, Ildarjin, and Ildrajīn; also known as Andarjīn, Enderajīn, Enderjīn, and Indrājīn) is a village in Kharaqan-e Sharqi Rural District, Abgarm District, Avaj County, Qazvin Province, Iran. At the 2006 census, its population was 159, in 54 families.