Oja may refer to:
- Places
- Oja (river), river in La Rioja, Spain
- Öja (island), island in Kokkola region, Finland
- Ōja Station, railway station in Hashikami, Japan
- 5080 Oja, main-belt asteroid, named after Tarmo Oja
Read more about Oja: People
Oja may refer to:
Read more about Oja: People