The River Island State Park is a state park and recreational facility in Parker, Arizona.

Located in what is currently known as the Parker Strip, the 18 mile length of river between Headgate Dam and Parker Dam on the Colorado River, River Island State Park is a popular destination for park visitors seeking desert activities or river water sports. The park covers over one thousand, six hundred and seventy-seven acres of recreational areas and public spaces available for park visitors.

Popular activities in River Island State Park include hiking, swimming, boating, canoeing, kayaking, and camping. The park features full facilities for RV or primitive campers and park staff are available on the site for any questions or for assistance.