Guernsey State Park is a 8,602-acre worth of historical areas and wildlife, located in Guernsey, Wyoming. It is a National Historic District, containing historical landmarks.

The first landmark in Guernsey State Park is the Oregon Trail Ruts, which is a main road, heavily used in 1841 to 1869 for wagon and foot traffic. It is the best-preserved of its kind and was designated a National Historic Landmark in 1966.

The other historic area in Guernsey State Park is the location of the Civilian Conservation Corps buildings. There are 3 sites, 14 buildings, and 43 structures to this collection.

Aside from these sites, the state park is also known for its campgrounds, trails, reservoir, and the Guernsey State Park Museum that chronicles the natural and cultural history of the area.