From Existence to Infinity: the ethical reduction in the thought of Emmanuel intends to present the thought of Emmanuel Lévinas in its fundamental characteristic, that is like an ethical reduction. This hypothesis places the levinasian thought as the third stage of the Phenomenology based on the several features that distinguish it from the precedent philosophies of the phenomenon. Among this features, it is especially emphasized the change in the axis of philosophy that Lévinas intends to achieve, from Ontology to Ethics, as well as the inauguration of a new way of philosophy resulting from the consequent dislocations that this reduction performs (from Existence to the existents, from the Same to the Other, from Masculine to Feminine etc.). Therefore, the aim of this research is concentrated on indicating the specificity of the philosophical discourse of Lévinas, starting from a dialogue with the philosophical tradition (and above all the debate with the thought of Being) and motivated by the questions concerning to Existence, Humanism, death, love and justice.