Institutional developments in Pacific Islands regionalism have been dramatic in recent years. These include the changing role of the Parties to the Nauru Agreement, a grouping of eight ‘tuna-rich’ Pacific Island states that is transforming the dynamics of regional fisheries; the emergence of a more activist Melane- sian Spearhead Group, which comprises the four largest economies of the Pacific Islands and is leading the process of regional economic integration; and the establishment of the Pacific Islands Development Forum, which promises a more inclusive ‘regionalism through partnerships’ approach in addressing climate change and sustainable development issues. This new dynamism is driven by the discontent of a growing number of island states with the established regional order, defined by prevailing institutions, power and ideas, and by a desire to assert greater control over their own futures. Against the backdrop of an increasingly dynamic geopolitical and geo- economic landscape, Pacific Island states are using alternative regional frameworks to develop new approaches to the challenges facing them.