| F.J. McLain State Park | |
| Iucn Category: | III |
| Iucn Ref: | [1] |
| Photo Width: | 280 |
| 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 |
| Named For: | Frederick J. McLain |
| Administrator: | Michigan Department of Natural Resources |
| Website: | McLain State Park |
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.
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. The park also offers fishing, picnicking, hiking and cross-country skiing trails, camping, and cabins.
During the first week of the fall semester, Michigan Technological University cancels afternoon classes to allow students and faculty to hold "K-Day" (or "Keweenaw Day") a registered student organization fair. From 1976 to 2017 this fair was held at Mclain State Park. This halted after severe weather damage in June 2018. "K-Day" has been held at Chassell Centennial Park in Chassell, MI since with the exception of 2020 because of COVID precautions.
The spelling of the park's name is inconsistent on roadsigns and in local publications, varying between "McLain", "MacLain", and "McClain", and is often referred to by locals as "McLain's."