| Oyakjung | |
| Native Name: | ओयाक्जुङ |
| Settlement Type: | Village development committee |
| Mapsize: | 300px |
| Pushpin Map: | Nepal |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Nepal |
| Subdivision Type: | Country |
| Subdivision Name: |  Nepal |
| Subdivision Type1: | Zone |
| Subdivision Name1: | Kosi Zone |
| Subdivision Type2: | District |
| Subdivision Name2: | Terhathum District |
| Population As Of: | 1991 |
| Population Total: | 4648 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Timezone: | Nepal Time |
| Utc Offset: | +5:45 |
| Coordinates: | 27.19°N 87.56°W |
Oyakjung is a village development committee in the Himalayas of Terhathum District in the Kosi Zone of eastern Nepal (Purvanchal Nepal). At the time of the 1991 Nepal census it had a population of 4648 people living in 819 individual households.[1]