The article considers the essence of the intellectual capital of the diplomatic service. It is determined that the peculiarity of the development of the world market economy is the formation of the knowledge economy, which in turn has radically changed the principles of socio-economic development. Knowledge and information are gradually becoming one of the key factors in the development of the state. The study of the development of intellectual capital of the diplomatic service is now of great importance, has both theoretical and practical significance for the effective functioning of the civil service, as well as the implementation of effective public administration of foreign policy and international cooperation. The task of effective state management of the intellectual capital of the diplomatic service is to expand the powers and create the preconditions for the successful operation of the institution. Integration and combination of existing methods and tools with new innovative forms allows to expand the competencies of the institution and improve its activities. Intellectual capital is an important factor in innovation and the implementation of effective public foreign policy. The article systematizes the essence of the concept of "intellectual resources" as a system of a set of forms of intellectual resources of the institution, which are formed in the process of mastering the latest knowledge for sustainable development. It is proved that intellectual capital includes three main components: human capital, relationship capital and structural capital. It is determined that the strengthening of the processes of integration and globalization requires the state to improve the system of training, retraining and personnel management of the diplomatic service of all levels in order to have effective strategies at the international level. The work of the state in the field of foreign policy and international relations will depend on the effective improvement of the management of intellectual resources. The effectiveness of the entire diplomatic environment will depend on how successfully the diplomatic mechanism adapts to the new international information environment.