| Big River State Forest | |
|---|---|
IUCN category VI (protected area with sustainable use of natural resources) | |
  Map of the U.S. state of Illinois showing the location of Big River State Forest | |
| Location | Henderson County, Illinois, USA |
| Nearest city | Keithsburg, Illinois |
| Coordinates | 41°00′37″N 90°54′45″W / 41.01028°N 90.91250°W |
| 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 (1,200 ha).