List of Pennsylvania state forest natural areas

The Commonwealth of Pennsylvania in the United States includes 58 natural areas in its State Forest system. They are managed by the Pennsylvania Bureau of Forestry, a division of the Pennsylvania Department of Conservation and Natural Resources.
The Commonwealth describes a natural area as a location with "scenic, historic, geologic or ecological significance, which will remain in an undisturbed state, with development and maintenance being limited to that required for health and safety. Natural areas are set aside to provide locations for scientific observation of natural systems, to protect examples of typical and unique plant and animal communities, and to protect outstanding examples of natural interest and beauty." Many such areas are only accessible on foot, and several do not have any maintained hiking trails.
This list does not include additional natural areas that are protected within the Pennsylvania State Park system.

Natural area name	State forest	County	Area	Date founded	Remarks
Alan Seeger Natural Area	Rothrock	Huntingdon		1921	Named after the poet who died during World War I. Includes old growth forest remnants.
Algerine Swamp Natural Area	Tiadaghton	Lycoming, Tioga			Includes a glacial bog.
Anders Run Natural Area	Cornplanter	Warren		1987	Includes a stone house built in 1841.
Bark Cabin Natural Area	Tiadaghton	Lycoming			Traversed by the Mid State Trail; features old growth hemlocks.
Bear Meadows Natural Area	Rothrock	Centre		1965	Also a National Natural Landmark.
Bear Run Natural Area	Bald Eagle	Centre
Beartown Woods Natural Area	Michaux	Franklin			Accessible via the Appalachian Trail.
Big Flat Laurel Natural Area	Rothrock	Centre, Huntingdon
Black Ash Swamp Natural Area	Tioga	Tioga
Bruce Lake Natural Area	Delaware	Pike			Includes both a natural glacial lake and a man-made lake.
Buckhorn Natural Area	Delaware	Pike			Also a designated Reptile and Amphibian Protection Area.
Carbaugh Run Natural Area	Michaux	Adams			Also a designated Reptile and Amphibian Protection Area, and founded to protect Native American archeological sites.
Charles F. Lewis Natural Area	Gallitzin	Indiana			Named after an area journalist and conservationist.
Cranberry Swamp Natural Area	Sproul	Clinton			Encompasses a boreal swamp.
David R. Johnson Natural Area	William Penn	Bucks			Named for its former landowner.
Detweiler Run Natural Area	Rothrock	Huntingdon			Also a designated Important Bird Area.
Devil's Elbow Natural Area	Loyalsock	Lycoming			Protects a population of pitcher plants.
East Branch Swamp Natural Area	Sproul	Clinton
Forrest H. Dutlinger Natural Area	Susquehannock	Clinton			Named after an early Commonwealth forester; includes old growth forest remnants.
Frank E. Masland Natural Area	Tuscarora	Perry			Also a designated Reptile and Amphibian Protection Area.
Halfway Run Natural Area	Bald Eagle	Union
Hemlocks Natural Area	Tuscarora	Perry
The Hook Natural Area	Bald Eagle	Union			Encompasses an entire regional watershed.
Hoverter and Sholl Box Huckleberry Natural Area	Tuscarora	Perry		1967	Features a rare box huckleberry colony believed to be more than 1,300 years old.
Jakey Hollow Natural Area	Weiser	Columbia		1990
Johnson Run Natural Area	Elk	Cameron
Joyce Kilmer Natural Area	Bald Eagle	Union		1921	Named after the poet and naturalist.
Kettle Creek Gorge Natural Area	Loyalsock	Sullivan		1970	Traversed by the Loyalsock Trail.
Lebo Red Pine Natural Area	Tiadaghton	Lycoming			Encompasses an uncommon unplanted grove of red pines.
Little Juniata Natural Area	Rothrock	Huntingdon
Little Mud Pond Swamp Natural Area	Delaware	Pike			Encompasses a boreal swamp.
Little Tinicum Island Natural Area	William Penn	Delaware			An island in the Delaware River.
Lower Jerry Run Natural Area	Elk	Cameron
Marion Brooks Natural Area	Moshannon	Elk			Named after an area conservationist. Includes one of the largest known stands of white birch trees in the eastern United States.
Meeting of the Pines Natural Area	Michaux	Franklin		1974	Adjacent to the Penn State Mont Alto campus.
Miller Run Natural Area	Tiadaghton	Lycoming
M.K. Goddard/Wykoff Run Natural Area	Elk	Cameron		1965	Features industrial ruins from nuclear research in the 1950s-60s. Partially renamed in the 2010s as a tribute to Maurice K. Goddard.
Mount Cydonia Ponds Natural Area	Michaux	Franklin			Encompasses about 60 vernal ponds.
Mount Davis Natural Area	Forbes	Somerset			Includes the highest point in Pennsylvania.
Mount Logan Natural Area	Bald Eagle	Clinton			Also a designated Reptile and Amphibian Protection Area.
Pennel Run Natural Area	Delaware	Pike
Pine Creek Gorge Natural Area	Tioga	Tioga		1968	Also a National Natural Landmark; largest of the State Forest Natural Areas. Traversed by the West Rim Trail and Pine Creek Rail Trail.
Pine Lake Natural Area	Delaware	Pike
Pine Ridge Natural Area	Buchanan	Bedford		1970	Features reclaimed farms and resettlement lands.
Pine Tree Trail Natural Area	Elk	Elk			Named after an interpretative trail featuring educational exhibits.
Reynolds Spring Natural Area	Tioga	Lycoming, Tioga
Roaring Run Natural Area	Forbes	Westmoreland		1975
Rocky Ridge Natural Area	Rothrock	Huntingdon
Rosencrans Bog Natural Area	Bald Eagle	Clinton
Ruth Zimmerman Natural Area	William Penn	Berks			Named after its former landowner; consists of two tracts.
Sheets Island Archipelago Natural Area	Weiser	Dauphin			A series of islands in the Susquehanna River.
Snyder-Middleswarth Natural Area	Bald Eagle	Snyder		1921	Includes old growth forest that was scheduled to be logged in 1902.
Spruce Swamp Natural Area	Pinchot	Lackawanna			Includes a glacial bog.
Stillwater Natural Area	Delaware	Pike			Traversed by the Thunder Swamp Trail. Originated as a sanctuary for Civil War deserters.
Sweet Root Natural Area	Buchanan	Bedford		1921	Includes old-growth hemlocks demonstrating woolly adelgid damage.
Tall Timbers Natural Area	Bald Eagle	Snyder
Tamarack Run Natural Area	Loyalsock	Sullivan
Tamarack Swamp Natural Area	Sproul	Clinton		1998	Includes a boreal bog.
Torbert Island Natural Area	Tiadaghton	Lycoming			A large island and smaller nearby islands in Pine Creek.