The quarrel between mythos and logos in Plato s writings is widely commented, and the philosopher is responsible for both the estrangement and the approximation of these two instances in philosophy. The dissertation set out to analyze the telling of myths (or mythologization) in Plato s Republic, in which the characters of the dialogue narrate myths, make judgments about them, offer a definition of mythos, prescribe those that are useful to the city and unveil the beautiful spectacle of Hades in the crowning of the dialogue with the telling of the myth of Er. All this while the process of building the ideal-city itself is explicitly called by Socrates a mythologization in logos in 376d and 501e. In this sense, we aimed to examine relevant occurrences of the word mythos at different times in the work, commented by the diverse characters and in their various contexts, in order to show their different meanings, structures and objectives in each framework, in addition to highlighting the centrality of this theme in the dialogue. In view of this rich debate constructed in the course of The Republic, it was proposed to explore the possible mythical aspect of Kallípolis, observing how it is a mythologization in logos and how it is possible to understand the use of mythos in this context, considering the whole scenario portrayed in the work and the subjects discussed by its characters.