| Nelson Dewey State Park | |
| Wisconsin State Park | |
| Named for: Nelson Dewey | |
| Country | United States |
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| State | Wisconsin |
| County | Grant |
| Location | Cassville |
| - coordinates | |
| Area | 756 acres (306 ha) |
| Founded | 1935 |
| Management | Wisconsin Department of Natural Resources |
| IUCN category | V - Protected Landscape/Seascape |
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Nelson Dewey State Park is a 756-acre (306 ha) Wisconsin state park on the Mississippi River. The land was once part of the Stonefield estate of Nelson Dewey, the state's first governor.