Interest in clusters and cluster-based policies in Ireland dates back to the Culliton Report (Culliton, 1992), which highlighted the importance of a competitive business environment to the development of enterprise and recommended the promotion of clusters focused 'on niches in national competitive advantage' (Doyle & Fanning, 2007, p. 268). The Culliton Report's policy recommendations were heavily informed by Porter's (1990) definition and measurement of clusters. 1 Clusters were described as 'geographic concentrations of interconnected companies and institutions in a particular field' (Porter, 1998, p. 78). Porter (1990) identified the potential of clusters within a framework of locational competitive advantage as providing mechanisms for improving national, regional and local productivity, innovation capacity and new business formation. 2 ABSTRACT Motivated by ongoing research into the cluster concept that considers dynamic features of economic development and the cluster life cycle, differences between traded clusters and local activity across different spatial scales are examined for ireland. using recent cluster definitions for europe, this paper presents clustering patterns within the irish economy from 2008 to 2012. We report on data requirements when applying the benchmark cluster definitions to irish data. integrating small, open economy features with life-cycle concerns, we focus on specific clusters in ireland, along with their export performance, noting that appropriate cluster boundaries are neither regional nor national. analyses indicate that while ireland hosts a number of internationally competitive clusters, foreign-owned firms remain substantially more productive than indigenous enterprises. We identify the geographical location of these prominent clusters at the nutS-3 regional level and highlight the role of regional features for differences in adaptive cycles of clusters. We identify a substantial portion (60%) of irish regional wage variation relates to the different cluster mixes across regions.