The article presents a cultural and political analysis of the activities of the Belgrade International Theater Festival (BITEF) - a significant theatrical, general cultural and social phenomenon in Serbia, the Balkans / South-Eastern Europe, and throughout Europe as a whole. Before the collapse of the SFRY (1991-1992), being the official showcase of self-government socialism, the festival was at the same time one of the most representative shows of new theatrical trends in Europe. It was attended by troupes from the countries of the East and West - Western and Eastern Europe, the USSR, the USA, Latin America, China, Japan. Not being by definition a festival of political theater, thanks to the moral and civic position of its founders and leaders M. Trailovich and Y. Chirilov, BITEF has become a space of aesthetic and social free-thinking in the SFRY and in neighbouring socialist countries. The organizers of BITEF found an opportunity to provide a platform for theatrical «dissidents» with their performances dedicated to rethinking modernity and the recent past in any genre. During the existence of the FRY (1992-2003), BITEF became an annual cultural manifestation in opposition to the regimes in power in Serbia, Croatia, Bosnia and Herzegovina, with their ideology of chauvinism and isolation from the outside world. At this time, the compilers of the festival programs began to attach special importance to performances of a political and social orientation. Many theaters from Serbia, as well as from the former neighbours of the Yugoslavian federation, and now the newly independent states, in their productions offered not so much a political, as a moral and ideological alternative to ethnic nationalism, militarism and political intolerance. Since 2006, in the independent Republic of Serbia, BITEF has strived not only to revive the traditions of Serbian theater, but also to preserve the best traditions of the theatrical art of the peoples of the former Yugoslavia, placing them in the context of the common European and global development of theater and culture, ideology and philosophy, literature, aesthetics, ethics. In principle opposing nationalism and militarism from the standpoint of humanism, BITEF plays an outstanding role in shaping public attitudes in Serbia, in weakening and overcoming conflicts, in normalizing relations between the peoples of the disintegrated Yugoslavia, in creating an atmosphere of freedom and tolerance.