The proposition of establishing “global international relations” (Global IR) as an amalgamation of diverse national epistemologies in the field of international relations, potentially superseding the Western-centric paradigm, presents significant challenges. A critical inquiry emerges: Is it possible to form a discipline based on the polyphony of national approaches, despite the fact that the ontology of international relations has remained fundamentally unchanged since the mid-17th century? This study evaluates the thesis of extant national epistemologies in international relations by examining national traditions of diplomatic training. The primary research question is formulated as follows: What are the foundational approaches employed by leading states in the training of IR specialists, and can these approaches be considered reflective of national epistemologies regarding the nature of international relations? The research methodology involves a synthesis of findings from an examination of diplomatic training institutions across a diverse sample of countries. This sample encompasses Western nations (United Kingdom, Hungary, Poland, United States, Finland, France, and Germany), Asian countries (Vietnam, Indonesia, India, China, and the Republic of Korea), Middle Eastern states (Egypt, Iran, Saudi Arabia, and Turkey), African nations (Nigeria and South Africa), and Latin American countries (Brazil, Mexico, and Cuba). The article is structured in two principal sections. The theoretical section explores the hypothesis of “global international relations” within the context of existing literature and theoretical frameworks. The second section synthesizes the empirical findings from the study of national approaches to diplomatic training, testing the hypothesis of its correlation with national epistemologies in the field of international relations.