This essay on Global Regionalism examines Greece, a member of the European Union (EU), emphasising that regionalism transcends a strictly supranational framework or narrowly defined sub-regional micro-regions. Rather, Greek regionalism has emerged through interconnected forms, including hybrid cross-border micro-regions within the EU (De Lombaerde, 2010). The essay defines regionalism while considering both supranational and subnational dimensions, positing that the Greek case serves as a foundational element of regionalist thought. Instead of imposing contemporary regionalist theories onto Greece, it is more appropriate to acknowledge how historical developments in Greece have actively shaped regional governance. Greece has not only been a pioneer in democratic ideals but has also significantly influenced regionalist discourse, rendering its historical trajectory essential for understanding regionalism as a broader phenomenon. By exploring the evolution of Greek regionalism from the state level to its integration within the EU, this essay highlights the progression of regional governance over time and space. The history of regionalisation in Greece offers insights into the intellectual development of regionalism, shaped by historical transformations, administrative reforms, and EU policies. From the era of ancient Greek city-states to modern collaborative governance structures, Greece has undergone significant changes aimed at decentralisation, regional development, and economic stabilisation. Despite persistent challenges such as socioeconomic disparities and centralisation tendencies, the regionalisation process presents Greece with opportunities to enhance governance and foster collaboration in today’s interconnected global landscape.