The Congress of Vienna (1814-1815) as a important historical event for political and diplomatic and institutional development of Europe is analized at the article. The attention paid to the diplomatic tools, national specifics and peculiarities of negotiations on the Congress of European countries. Results of the Congress of Vienna served as an important stimulus for the further socio-economic, security, political and diplomatic European development. Practical achievements of the Congress of Vienna and the experience gained by European diplomacy of the late XVIII - early XIX century determined the future institutional development of world diplomacy, foreign policy and international law, not losing its relevance for today.