| Chain O'Lakes State Park | |
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IUCN Category III (Natural Monument)
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| Location | Lake and McHenry counties, Illinois, USA |
| Nearest city | Spring Grove, Illinois |
| Area | 2,793 acres (1,130 ha) |
| Established | 1945 |
| Governing body | Illinois Department of Natural Resources |
Chain O'Lakes State Park is a 2,793-acre (1,130 ha) Illinois state park at the inlet of the Fox River into the Chain O'Lakes in Lake and McHenry counties, in the suburban wildlife of Chicago, Illinois, USA.
It is one of the centerpieces of the proposed Hackmatack National Wildlife Refuge.