| Sainte-Marguerite River Old Forest | |
|---|---|
| Forêt ancienne de la Rivière-Sainte-Marguerite | |
  | |
| Nearest city | Sacré-Coeur, Quebec |
| Coordinates | 48°20′30″N 70°02′30″W / 48.3416667°N 70.0416667°W |
| Area | 37 ha (91 acres) |
| Designation | Old-growth forest |
| Designated | 2003 |
| Governing body | Quebec Ministère des Ressources naturelles, de la Faune et des Parcs |
The Sainte-Marguerite River Old Forest (French: Forêt ancienne de la Rivière-Sainte-Marguerite) is a protected area of old-growth forest in the Saguenay–Lac-Saint-Jean and Côte-Nord regions of Quebec, Canada. It is classified as an exceptional forest ecosystem. It protects an area on the northeast bank of the Sainte-Marguerite River.