The Leshy (also Leshi; Russian: леший, IPA: [ˈlʲeʂɨj]; literally, "[he] from the forest", Polish: boruta, borowy, leśnik, leśniczy, lasowik, leszy) is a tutelary deity of the forests in pagan Slavic mythology. As the spirit rules over the forest and hunting, he may be related to the Slavic god Porewit.

The Leshy is masculine and humanoid in shape, is able to assume any likeness and can change in size and height. In some accounts, Leshy is described as having a wife (Leshachikha, Leszachka, Lesovikha and also, sometimes, the Kikimora of the swamp) and children (leshonki, leszonky). He is known by some to have a propensity to lead travelers astray and abduct children (which he shares with Chort, the "Black One"), which would lead some to believe he is an evil entity. He is, however, also known to have a more neutral disposition towards humans, dependent on the attitudes and behaviours of an individual person, or local population, towards the forest. Leshy could take children who were cursed by their relatives (in particular, parents) away to the forest people. Some would therefore describe him as more of a temperamental being, like a fairy.