Francis Beidler Forest, Protected swamp forest in Four Holes Swamp, South Carolina.

Francis Beidler Forest is an Audubon wildlife sanctuary in Four Holes Swamp, a blackwater creek system in South Carolina. It covers over 18,000 acres of bald cypress and tupelo gum hardwood forest and swamp, including about 1,800 acres of old-growth forest, the largest virgin stand of cypress-tupelo forest in the world. A 1.75-mile boardwalk, established in 1977, crosses the old-growth portion.

The area was acquired by Francis Beidler in the 1890s and subsequently protected through conservation efforts by his family. After his death in 1924, the family continued stewardship until the National Audubon Society assumed management of the land.

The Four Holes Swamp area gained recognition in 2020 as part of the National Park Service's Underground Railroad Network to Freedom program.

A wooden boardwalk allows visitors to explore the swamp landscape on foot while observing wildlife from a safe vantage point. During warmer months, guided canoe trips and evening walks offer additional ways to experience the area.

The old-growth cypress-tupelo stand here is the largest virgin stand of its kind in the world, and it is one of only two old-growth forests left in South Carolina. The 1.75-mile boardwalk through it was built in 1977, and the swamp was named a Ramsar Wetland of International Importance on May 30, 2008.