The use of the country name "Macedonia" was disputed between Greece and the Republic of Macedonia (now North Macedonia) between 1991 and 2019. The dispute was a source of instability in the Western Balkans for 25 years. It was resolved through negotiations between the two countries, mediated by the United Nations, resulting in the Prespa Agreement, which was signed on 17 June 2018. Pertinent to its background is an early 20th-century multifaceted dispute and armed conflict that formed part of the background to the Balkan Wars. The specific naming dispute, although an existing issue in Yugoslav–Greek relations since World War II, was reignited after the breakup of Yugoslavia and the newly-gained independence of the former Socialist Republic of Macedonia in 1991. Since then, it was an ongoing issue in bilateral and international relations until it was settled with the Prespa agreement in June 2018, the subsequent ratification by the Macedonian and Greek parliaments in late 2018 and early 2019 respectively, and the official renaming of Macedonia to North Macedonia in February 2019.
The dispute arose from the ambiguity in nomenclature between the Republic of Macedonia, the adjacent Greek region of Macedonia and the ancient Greek kingdom of Macedon. Citing historical and irredentist concerns, Greece opposed the use of the name "Macedonia" without a geographical qualifier such as "Northern Macedonia" for use "by all ... and for all purposes". As a significant contingent of ethnic Greeks identify themselves as Macedonians and view themselves as unrelated to ethnic Macedonians, Greece further objected to the use of the term "Macedonian" for the neighboring country's largest ethnic group and language. North Macedonia was accused by Greece of appropriating symbols and figures that are historically considered part of Greek culture such as the Vergina Sun and Alexander the Great, and of promoting the irredentist concept of a United Macedonia, which involves territorial claims on Greece, Bulgaria, Albania, and Serbia.
