This dissertation has for objective to show the importance and signification of the reference to the greek philosophy in the thought of Werner Heisenberg, one of the main founders of quantum mechanics. The reference to the greek philosophy, constant in his writings, must first be situated in the context of the critics to modernity, one of the inherited lines of direction of Niels Bohr and one of the most basic characteristics of Heisenberg`s philosophy. That is, the greek thought is, for Heisenberg, a counterpoint to the beddings of the modern philosophy, whose limits are insurmountable with respect to the understanding of the problems presented for the modern physics. We believe, however, that is possible to affirm that the constant references, especially to Plato and Aristotle, have also a fundamental role with respect to the characterization of the level of reality proper to the quantum mechanics.