Mammoth Cave National Park is an American national park in west-central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world.

Since the 1972 unification of Mammoth Cave with the even-longer system under Flint Ridge to the north, the official name of the system has been the Mammoth–Flint Ridge Cave System. The park was established as a national park on July 1, 1941, a World Heritage Site on October 27, 1981, and an international Biosphere Reserve on September 26, 1990.

Mammoth Cave developed in thick Mississippian-aged limestone strata capped by a layer of sandstone, which has made the system remarkably stable. It is known to include more than 400 miles (640 km) of passageway.

Common fossils of the cave include crinoids, blastoids, and gastropods. The Mississippian limestone has yielded fossils of more than a dozen species of shark. In 2020, scientists reported the discovery of part of a 'Saivodus striatus', a species comparable in size to a modern great white shark.

The cave's name refers to the large width and length of the passages connecting to the Rotunda just inside the entrance. The name was used long before the extensive cave system was more fully explored and mapped, to reveal a mammoth length of passageways. No fossils of the woolly mammoth have ever been found in Mammoth Cave, and the name of the cave has nothing to do with this extinct mammal.

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