The purpose of this thesis is to present and explain Greece's foreign policy towards former Yugoslavia within the context of European Political Cooperation (EPC) during the period of June 1991-December 1992. This aspect of Greece's foreign policy was primarily defined by the dispute with the Former Yugoslav Republic of Macedonia (FYROM), that essentially constituted the more recent manifestation of the Macedonian Question. The analysis of Greek foreign policy within EPC will be based on the theory of institutionalism, which claims that international regimes can influence state behavior towards cooperative actions. The application of institutionalism requires the existence of common interests and the presence of at least one regime. This thesis shows the significant interests shared by Greece and FYROM, as well as how EPC can be viewed as a regime. Crucially, EPC was primarily responsible for dealing with issues arising from the disintegration of Yugoslavia during the months covered in this thesis. It will be demonstrated that until mid- January 1992, the Greek government pursued politics of cooperation and flexibility, often contrary to perceived national interests. These politics were primarily regime-produced and related, and hence explained by the theory of institutionalism. After 17 January 1991 however, Greece practised politics of limited cooperation within EPC and confrontation against FYROM. The issue of the new republic's exact name gradually became of paramount importance, provoking popular passions and subordinating all other issues and concerns connected to former Yugoslavia. Such developments were ultimately the result of domestic and partisan politics that were entirely unrelated to EPC, thus causing the decline of institutionalism's explanatory power. Given this record, the thesis will argue that the specific expansion of the conditions required for the application of institutionalism would allow the theory to retain its explanatory and predictive relevance. Finally, specific lessons on the conduct of Greek foreign policy will be discussed.