A wight (Old English: wiht) is a mythical sentient being, often undead.

In its original use the word wight described a living human being, but has come to be used in fictional works in the fantasy genre to describe certain immortal beings. An example of this use occurs in William Morris's translation of the Grettis Saga, where haugbui is translated as "barrow-wight". Wights also feature in J. R. R. Tolkien's world of Middle-earth, especially in The Lord of the Rings, and in George R. R. Martin's novel series A Song of Ice and Fire and HBO television series Game of Thrones. Since its 1974 inclusion in the RPG Dungeons & Dragons (D&D), it has become a recurring form of undead in other fantasy games and mods, such as Vampire: The Masquerade. and The Elder Scrolls V: Skyrim.