| Koivusuo Strict Nature Reserve | |
| Iucn Category: | Ia |
| Map: | Finland |
| Relief: | 1 |
| Location: | North Karelia, Finland |
| Coordinates: | 62.9756°N 31.4033°W |
| Area Km2: | 20 |
| Established: | 1982 |
| Governing Body: | Metsähallitus |
Koivusuo Strict Nature Reserve (Koivusuon luonnonpuisto) is a strict nature reserve located in the North Karelia region of Finland.
This reserve has been a regular place for visits by wolverines, bears, lynxes and wolves for most of the history.
Some of the Koitajoki trails (Tapion taival) go by the area.