This article examines the concept of neutrality in the international relations as one of the important elements of political sciences. The author considers that nowadays due to the international security system transition from Bi-polarity, the European neutrality will be most likely questioned by the evolutions of modern international affairs. Therefore, to understand the dynamic of European neutral states, international relations and international security experts have to conceptually and historically refresh knowledge about neutrality as the phenomenon of international relations, international security and international law.