| Olvassuo Strict Nature Reserve | |
| Iucn Category: | Ia |
| Map: | Finland |
| Relief: | 1 |
| Location: | Finland |
| Coordinates: | 65.1125°N 27.2678°W |
| Area Km2: | 71 |
| Established: | 1982 |
| Governing Body: | Metsähallitus |
Olvassuo Strict Nature Reserve (Olvassuon luonnonpuisto) encompasses 71km2 in the Northern Ostrobothnia and Kainuu regions of Finland. It is situated inside a larger, 270km2 protected area.
The reserve is part of Natura 2000 and Ramsar programmes.