The essay claims that logic and the philosophy of logic owe to Plato and that some logical issues marvelously are analyzed in his works.In the history of philosophy Plato is known as a philosopher that has prominence and authority in metaphysics and epistemology, but he almost is not taken into account in logical issues. However, Plato has considered deliberately some most important logical issues in his writings by a method of his own.The reason of such attitude is not so much any philosopher obliges to applying logic to Philosophical subjects as he profoundly is attentive to these subjects. Possibly, since Plato hasn't formulated systematically logical subjects, they are not to be considered as logic. But, undoubtedly, the logical point was noticed by Plato.