Duppy is a word of African origin commonly used in various Caribbean islands, including Barbados and Jamaica, meaning ghost or spirit. The word is sometimes spelled duffy.

It is both singular and plural. Much of Caribbean folklore revolves around duppy. Duppy are generally regarded as malevolent spirits who bring misfortune and woe on those they set upon. They are said to mostly come out and haunt people at night, and people from around the islands claim to have seen them. The "Rolling Calf" (a scary creature said to have chains around its body), "Three footed horse", and "Ol' Hige" are examples of the more malicious spirits.

In many of the islands of the Lesser Antilles, duppy are known as jumbies. Barbados also uses the word duppy and it holds the same meaning as it does in Jamaica.