Pine Lake State Park is a state park in Hardin County, Iowa, United States. The park comprises 585 acres (237 ha) encompassing two lakes: 50-acre (20 ha) Lower Pine Lake and 69-acre (28 ha) Upper Pine Lake. The park is located near Eldora and Steamboat Rock.

The Pine Lake campground has 124 camping units with electrical hook-ups, modern showers, restroom facilities and a trailer dump station. Half of the campsites are available on a first-come, first-served basis, while the remainder must be reserved.

The park contains four stone and timber cabins that were built by the Civilian Conservation Corps and the Works Progress Administration in the 1930s. The cabins can be reserved online through the park reservation system.

There are more than 10 miles (16 km) of developed trails around the lake. Trails are marked with points of interest that correspond with trail brochures available at trail heads, the campground and the park office.

There is also a 50-mile (80 km) Lake-to-Lake State Park Bike Route connecting Pine Lake and George Wyth Memorial State Parks. Details here:

Both lakes are stocked with bass, crappie, northerns, and catfish. The Iowa River borders a portion of the park and is noted for its channel catfish and smallmouth bass. A beach is located on the lower lake.

Boats and canoes are no longer available for rental, and there was no concessionaire for 2009. There are boat ramps are on both lakes. Only electric motors may be used.

• Pine Lake State Park