| F.J. McLain State Park | |
| Photo Width: | 280 |
| Photo Alt: | Sunset |
| Map: | USA Michigan#USA |
| Map Width: | 280 |
| Relief: | 1 |
| Location: | Hancock Township, Houghton County, Michigan, United States |
| Nearest City: | Calumet, Michigan |
| Coordinates: | 47.2369°N -88.6092°W |
| Area: | 443acres |
| Designation: | Michigan state park |
| Established: | 1930 |
| Free Label: | Named for |
| Free Data: | Frederick J. McLain |
| Administrator: | Michigan Department of Natural Resources |
F.J. McLain State Park is a 443acres public recreation area on the Keweenaw Peninsula in Houghton County, Michigan. The state park is located on M-203 halfway between Hancock and Calumet. It is about from each city. The park's offshore sights include sunsets over Lake Superior and the art deco–style Keweenaw Waterway Upper Entrance Light.
The park is named after Houghton County Commissioner Frederick J. McLain, an instrumental figure in securing land for the site in the 1930s. Laborers working through the Work Projects Administration (WPA) performed most of the park's construction. A new entrance and contact station were built in 1965, following the relocation of M-203.
The park offers fishing, picnicking, hiking and cross-country skiing trails, camping, and cabins.. While the majority of the shoreline is rocky, a stretch known as the Breakwaters near the Keweenaw Waterway at the park's southern end provides a sandy beach for swimming.