In the article, the author comprehensively analyzes the European system of combating terrorism. For decades, Europe has suffered from various forms of terrorism. The formation of the legal framework for countering the various manifestations of terrorism has become more active in Europe immediately after the Second World War. Today the international organizations are also actively involved in the fight against terrorism. It should be noted the efforts of the Council of Europe, the EU, the OSCE and the CIS in the field of combating and preventing terrorism. First of all, they have adopted a number of regional international legal instruments that define the parameters of cooperation of the states in the fight against international terrorism. In this context and regarding the fact that the terrorist organization "Islamic state" (IS) mentioned Moldova among the 60 countries, which it considers its enemies, the problem of the terrorism prevention on the territory of Moldova and the international cooperation of our country in the fight against terrorism becomes increasingly relevant.