Fern Canyon, Natural canyon formation in Prairie Creek Redwoods State Park, California.

Fern Canyon is a narrow gorge in Prairie Creek Redwoods State Park, Humboldt County, California, where Home Creek runs over a floor of pale gravel and small stones. Its sheer walls rise 50 feet (15 m) and are densely covered with California native ferns, some fronds hanging and roots exposed. A dark fallen trunk lies across the right side, slanting down toward the creek bed.

The Pacific Lumber Company donated 2,125 acres to the State to add to Prairie Creek State Park. In 1968 the US government made the redwoods, including Fern Canyon, a national park. In 1980 the area was designated a World Heritage Site and an International Biosphere Reserve.

The site served as a filming location for The Lost World: Jurassic Park and BBC's Walking with Dinosaurs, drawing worldwide attention to the canyon. Visitors can recognize the spots where dramatic scenes were shot as they walk through.

The Fern Canyon Trail starts at the bottom of the canyon, a quarter mile north of the Fern Canyon Day Use Area via the California Coastal Trail. The loop is 0.5 miles (0.8 km) and connects to the James Irvine Trail. Expect wet, slippery footing along Home Creek and cool, damp air inside the canyon.

Fern Canyon's walls host five named fern species, among them western sword fern (Polystichum munitum), deer fern (Struthiopteris spicant) and California polypody (Polypodium californicum). The canyon's prehistoric look led filmmakers to use it for The Lost World: Jurassic Park and the BBC series Walking with Dinosaurs.