O'Leno State Park, State park in Columbia County, Florida, United States

O'Leno State Park is a natural area along the Santa Fe River featuring diverse landscapes across its terrain. The park contains river swamps, hardwood forests, sandhills, and multiple sinkholes that shape how water moves and wildlife inhabits the region.

A town called Keno, named after a lotto game, once stood here with a cotton gin and a sawmill. In 1876, ministers and businessmen renamed it Leno to improve its reputation; the current name means "Old Leno". After the railroad bypassed the town, it became a ghost town, and many park facilities were built by the Civilian Conservation Corps in the 1930s.

The park shapes how locals and visitors connect with Florida's natural landscape through outdoor recreation and nature exploration. The structures built in the 1930s remain visible throughout the grounds, reflecting the craftsmanship of workers who opened this place to the public.

O'Leno State Park lies on U.S. 441, six miles north of High Springs, and is open from 8 a.m. until sundown every day of the year, holidays included. Trails total more than 13 miles for hiking, biking and horseback riding, and camping ranges from family sites to primitive, youth and group areas. The Santa Fe River sinks underground inside the park and rises again 3.5 miles away, so plan walks around that land bridge.

The Santa Fe River sinks into a sinkhole inside the park and rises again about 5.6 km (3.5 miles) away at River Rise Preserve State Park, leaving a natural land bridge. The historic Bellamy Road once crossed that dry bridge. The park's facilities were largely built by the Civilian Conservation Corps in the 1930s.