The objective of this thesis is to study the forms that Dionysius assumes during Nietzsche s thoughts. He follows Nietzsche throughout his intellectual production, connecting directly or indirectly to all the major themes of his philosophy. However, the meaning of Dionysus is not the same throughout his work; on the contrary, its significance undergoes a radical transformation. First, Nietzsche finds in Dionysius a key to understand the old greeks world s view and deciphering one s own existence. In his early writings, which comprised a stage known as the artist s metaphysics, the Dionysian is essential to an aesthetic theory that recognized in the musical element of greek tragedies, the high point of Western culture. However, the philosopher breaks with his own precepts, get distance from schopenhaurian pessimism and that of Wagnerian aesthetics. Suspends, temporarily, the mentions to the god and begins the elaboration of a tragic philosophy, that is, fighting all ways of denial of life. The second Dionysus is reborn in the Nietzschean work unclad of garb. He is now related to immanence, to instincts, to the affirmation of existence and to the praise of the instant. Considering that, this thesis is divided into four parts, together, forming a whole, a true Nietzschean tragoedia: first, who was the ancient god Dionysus; second, what are the philosophical unfoldings of The Birth of tragedy; third, what comes to the scene when Dionysus is silent; and, finally, what are the nuances of the reborn Dionysus and what is his importance, according to Nietzsche, for the culture and for life.