The interest of international relations theories and security studies for identity, the process of its constitution, the impact on security practices and the relationship between identity and security, has grown rapidly since 1980s, especially after the end of the Cold War. Security is one of the key factors for establishing and understanding identity, from individual to national, and it forms the basis for creation and definition of supranational identity. The long history of search for the purpose of identity has placed the individual in the focus of attention and their struggle with all the forces that have endangered a stable self and self-identity, which has the continuity and biography of rather certain future. In traditional societies, the individual had no (self) reflexive perception of himself/herself and the environment that they later have nowadays in modern society. The Renaissance begins the transformation of the identity of the modern era, and the rationalistic approach and the separation of social thought from the dogmatic discipline of religion link identity to a person, the desirable ability of self-reflexive observation and change according to personal preferences, social circumstances and achieving consent in building social relationships. Here is the beginning of the new humanism and the birthplace of liberal democracies. A modern man and a modern state have since remained in the foundation of a social theory that approaches collective identity primarily politically, starting from the relationship of power. Therefore, the consideration of identity in this paper, from individual to supranational, is mainly the consideration of the definition and understanding of political and security communities in relation to other actors - from the individual to wider collectivities in the international system.