There have been a number of articles about ASEAN's centrality in the regional security architecture of Asia. Yet, the notion of centrality remains undefined and under-operationalised. Implicit in the discourses of centrality is the idea of ASEAN's leadership, which in turn raises questions about ASEAN's ability to do so, given its limited capacity. This article defines ASEAN's centrality from the perspective of social network approach and argues that ASEAN's structural position in the density of networks that it has established and those that it has linkages with explains ASEAN's centrality. Despite its lack of material power, ASEAN has been able to claim centrality because of its position as a node in a cluster of networks, and this condition of 'high betweenness' allows ASEAN to exercise influence in regional processes with the tacit acceptance of major powers. However, while centrality may have been achieved, maintaining centrality in a rapidly changing regional environment compels ASEAN to address challenges to its centrality. This would necessarily include its ability to maintain consensus, carry out collective action and achieve its stated goals.

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