The El Dorado State Park is a state park and recreation area in El Dorado, Kansas. It is noted for being the largest unit in the Kansas state parks system.

Offering 4000 acres along the western and eastern shores of the El Dorado Reservoir, the El Dorado State Park is perfect for a great variety of recreational opportunities. Fishing is the most popular activity at the site, allowing anglers to catch crappie, largemouth bass, walleye, channel catfish, and flathead. However, aside from that folks can also enjoy boating, bicycling, camping, hiking, hunting, horseback riding, picnicking, and RVing at the park. Swim beaches are also available.

Built in 1981 by the US Army Corps of Engineers, the El Dorado State Park is also deemed as one of the most handicapped accessible state parks in Kansas.