The article deals with the peculiarities of professional training of masters of international relations in Great Britain. It has been discovered that the basic features predetermining the functioning of the system of professional training of masters of international relations in Great Britain are general-pedagogic and specific principles that reflect the specifics of master’s educational process organization. New criteria of professional training of masters of international relations have been outlined, namely: focus of educational programs on education outcome; a credit-module structure of educational programs; a clear system of education quality support; the appropriate system of credits transfer; the organization of professional training on the basis of competence approach and scientific-research paradigm. The educational, educational-research and profession-oriented programs of masters in international relations training in Great Britain envisaging the training of international relations masters in different branches of specialization have been singled out. The peculiarities of the organization of educational process according to the research master’s degree program in the sphere of politics and international relations at Cambridge University have been analyzed. The peculiarities of admission to master’s degree program at Cambridge and Oxford Universities, the general requirements, the list of documents needed and the procedure of its submission have been described. The importance of the new pedagogical technologies and scientific-methodologic results implementation in educational process, the creation of new system of master’s education information support have been proved. Scientific-research and self-study play an important role in professional training. The priority aims of professional training system development of masters in international relations in Great Britain have been pointed out.An important factor in the development of vocational training Masters of International Relations in the UK is a state legislative support, which involves cooperation of all social partners. This collaboration involving non-governmental and community organizations, which is responsible for interaction and create opportunities for learning throughout life, while providing recognition and accreditation. The prospects for further research study outlined the problem is to study the concept of research training masters of international relations at universities in the UK.