| Fort Massac State Park | |
|---|---|
IUCN category V (protected landscape/seascape) | |
 The 2002 reconstruction of the 1802 Fort Massac, with the Ohio River in the background. The original, 1757 French fort foundation impression, can be seen at center-right, beyond the trees. | |
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| Location | Massac County, Illinois |
| Nearest city | Metropolis, Illinois |
| Coordinates | 37°08′38″N 88°41′14″W / 37.14389°N 88.68722°W |
| Area | 1,450 acres (587 ha) |
| Established | 1908 |
| Governing body | Illinois Department of Natural Resources |
Fort Massac Site | |
   | |
| Nearest city | Metropolis, Illinois |
| Built | 1757 |
| NRHP reference No. | 71000293[1] |
| Added to NRHP | July 14, 1971 |
Fort Massac (or Fort Massiac) is a French colonial and early National-era fort on the Ohio River in Massac County, Illinois, United States.
Its site was listed on the National Register of Historic Places in 1971.