Birkan, Onur2026-01-152026-01-1520251468-38491743-9663https://doi.org/10.1080/14683849.2025.2602706https://hdl.handle.net/20.500.12514/10173Turkish foreign policy has shifted over the past two decades from a 'value-rational' foreign policy to a more 'purpose-rational' foreign policy. This shift is driven by changes in three key pillars: civilianization of decision-making processes, defense industry advancement, and changes in the government system. This article begins by framing and contextualizing the two abovementioned foreign-policy concepts. Then, under each pillar, I explore how Turkish foreign policy initially followed a value-rational paradigm and later transitioned to a purpose-rational foreign policy post-2000. I conclude by analyzing the sustainability of this shift and considering its potential long-term consequences for Turkish foreign policy.en10.1080/14683849.2025.2602706info:eu-repo/semantics/closedAccessTurkish Foreign PolicyRationality ShiftValue-RationalityPurpose-RationalityArticle2-s2.0-105024824282