Kelleys Island State Park is a public recreation area occupying one-quarter of Kelleys Island, an island in Lake Erie located 13 mi northeast of Port Clinton, Ohio, in the United States. The state park's 677 acre include 6 mi of hiking trails, ruins of lime kilns and quarrying operations, sand beach, and campground. The park was established in 1956. 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 State Nature Preserve, a lake embayment usually separated from the lake by a sand bar.

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