| Big River State Forest | |
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IUCN Category VI (Managed Resource Protected Area)
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| Location | Henderson County, Illinois, USA |
| Nearest city | Keithsburg, Illinois |
| Area | 2,900 acres (1,174 ha) |
| Established | 1925 |
| Governing body | Illinois Department of Natural Resources |
Big River State Forest is a conservation area on 2,900 acres (1,174 ha) in Henderson County, Illinois, United States. The land was first acquired in 1925 as only a 200-acre (81 ha) refuge, but subsequent land purchases raised the total to 2,900 acres (12 km2).