The concepts of diplomacy and foreign policy are directly connected. Continuing events on the world stage and the interaction of political figures (heads of state and diplomatic workers) lead to the formation of a common international situation. The current general international situation has a significant effect on the foreign policy of countries. Diplomacy is a key tool for the successful conduct of the foreign policy of each active participating state. Foreign policy significantly affects the independent system of law governing interstate relations, while diplomacy helps to formulate general international rules for this system. In this respect, the relationship of the concepts under consideration is clearly expressed. In the course of the study there are lexical units of the semantic field “diplomacy” and “foreign policy” were selected from Russian and English dictionaries with political and diplomatic designations; there was studied and verified the material in the form of diplomatic documents, protocols and international agreements.