The bunyip (usually translated as "devil" or "spirit") is a mythical creature from Australian folklore. Various accounts and explanations of bunyips have been given across Australia since the early days of the colonies. It has also been identified as an animal recorded in Aboriginal mythology, similar to known extinct animals.

Descriptions of bunyips vary widely. It is usually given as a sort of lake monster. Common features in Aboriginal descriptions include a dog-like face, dark fur, a horse-like tail, flippers, and walrus-like tusks or horns. According to legend, they are said to lurk in swamps, billabongs, creeks, riverbeds, and waterholes.

Although no documented physical evidence of bunyips has been found, it has been suggested by cryptozoologists that tales of bunyips could be Aboriginal folk memory of the Diprotodon, or other extinct Australian megafauna which became extinct some 50,000 years ago, such as the Procoptodon, a Kangaroo-like animal, that had a rounded face and could lift its arms above head height, or the Quinkana, a land-crocodile.