The notion of fear was initially depicted in the lexicography of Greek mythology. Its philosophical assessment has to be traced mainly in the works of Aristotle and, subsequently, of his commentators. Four of his treatises contain valuable information on this subject: Poetics, Nicomachean Ethics, On the soul and Rhetoric. In the Poetics he restricts himself in defining fear as just a singularly emotional situation, related to the production of sentiments and leading with pity progressively to the katharsis in tragedy. But the most interesting passages of his thought on the subject are to be found disperse in Nicomachean Ethics, in his work On the soul and in his art of Rhetoric. In these three works he treats fear as a mental state or activity, keeping its inspection under the overall condition of right reason and implicating its psychological and physical parameters. In the paper to present, I will attempt to implement an evaluation of all available material found in the above mentioned three treatises, in order to restore a coherent assessment of fear within the scope of the Aristotelian philosophy.