This work proposes a revision and delimitation of the fantasy genre that will fundamentally occur through the dialogue with the notions of fairy tales and fantasy as formulated by J. R. R. Tolkien (2013) in his essay On Fairy Stories. In terms of revision, it will be done a comparison between The Lord of the Rings author's theory and the ones by critics such as Manlove (1982, 1990), Laetz and Johnston (2008), Stableford (1990), Attebery (1980, 1990, 1992). Regarding delimitation, it will interest us, particularly, the counterpoint with the marvelous as thought by Todorov (2007). This posture will contribute to fantasy's affirmation as a better lineate and coherent genre, contributing also to the cohesion of the marvelous itself, since it is...