In Irish mythology, a leprechaun (Modern Irish: leipreachán) is a type of male faerie said to inhabit the island of Ireland. They are a class of "faerie folk" associated in Irish mythology and folklore, as with all faeries, with the Tuatha Dé Danann and other quasi-historical races said to have inhabited Ireland before the arrival of the Celts.

Leprechauns and other creatures of Irish mythology are often associated with "faerie forts" or "faerie rings" — often the sites of ancient (Celtic or pre-Celtic) earthworks or drumlins.

They usually take the form of old men who enjoy partaking in mischief. Their trade is that of a cobbler or shoemaker. They are said to be very rich, having many treasure crocks buried during war-time. According to legend, if anyone keeps an eye fixed upon one, he cannot escape, but the moment the eye is withdrawn he vanishes.