This paper aims to further our emerging knowledge on the external linkages of regional clusters. We adopt a network governance perspective and study connected clusters as goal-directed, multilevel whole networks that we denote as "cluster networks." Based on an analysis of four empirical cases varying in regional scope, age and industry context, we identify two governance forms: internally governed cluster networks are formed to establish ties among cluster representative organizations to share knowledge and pool resources on selected activities; externally governed cluster networks are formed to systematically develop cross-cluster ties and competences on and across levels and are brokered by a central intercluster administrative organization as well as several decentralized lead organizations. Our findings show that cluster connectivity can go beyond organization-based pipelines and personal relationships to include clusters as governed entities, albeit with different intensities regarding the brokerage of ties on lower levels.