Kelleys Island State Park is a 676-acre (274 ha) Ohio, United States, state park established in 1956 that makes up almost all of the northern third of Kelleys Island in Lake Erie. The park offers 6 miles (9.7 km) of hiking, ruins of lime kilns and quarrying operations, a sand beach and a campground. The park cooperates with other agencies to manage the adjoining Glacial Grooves State Memorial, a set of rare glacial grooves, North Shore Alvar State Natural Area, a rare alvar habitat, and the North Pond Nature Preserve, a lake embayment usually separated from the lake by a sand bar.