This article highlights the history of the emergence and development of diplomatic terminology, the formation of the system of international relations, the introduction of diplomatic terms into the language through assimilation, the influence of English, which gained the status of an international language in the 20th century, on the terminological system of the diplomatic language. Scientifictheoretical views of scientists who conducted scientific research in the field of diplomatic terminology and their classification and descriptive approaches to the study of diplomatic terms are covered in the article.