This article seeks to expand the discussion on Methodological Nationalism (MN) within the discipline of International Relations (IR), to contribute to MN literature from the perspective of IR studies and to evaluate the prevalence of MN in the field by the quantification of selected works. To achieve these goals, the article, firstly, recapitulates the general MN literature and critically evaluates this discussion in IR. Later, it identifies the forms of MN as they appear in IR with two faces:

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... evel of analysis (nation-as-arena) and unit of analysis (nation-as-actor). Secondly, the article proposes a method to assess the prevalence of MN through quantification. Finally, the article applies its method to IR works to address the question of how widespread MN is in academia in Turkey. The findings demonstrate the proportional pervasiveness of MN within the IR community of Turkey, which is part of the "periphery" in the discipline. The findings also let us draw some hypothetical conclusions, which have the potential to be a springboard for further research on the MN-IR nexus.