The Harry S Truman State Park is a state park and recreation area in Warsaw, Missouri. It features the Truman Lake, also known as the Truman Reservoir, which has a total surface area of more than fifty five acres.

The Harry S Truman State Park was built by the US Army Corps of Engineer as a part of their flood control project. Work began in August 1964 and was originally known as the Harry S. Truman Dam and Reservoir, after the former president and Missouri native, Harry S. Truman. It was completed in 1979.

Visitors of the Harry S Truman State Park can enjoy a great amount of recreational opportunities at the site including fishing, boating, camping, swimming, hiking, and picnicking.