Chapel perilous is a term best known from Thomas Malory's Arthurian compilation Le Morte d'Arthur as the setting for an adventure in which the sorceress Hellawes unsuccessfully attempts to seduce the knight Lancelot. Malory was partially inspired by the chapel perilous adventure of the knight Gawain in Perlesvaus, as well as corresponding ghost episodes featuring Perceval in Wauchier's and Manessier's respective continuations of Perceval, and Gawain and Hector de Maris in the Vulgate Queste, that tend to combine it with the related theme of the perilous cemetery. A similar motif, but featuring Lancelot, also appears in the Prose Lancelot and in the romance Chevalier à deux Espées.

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