Identifying stakeholders and analysing the pattern of relationships among them are important steps toward collaborating with individuals and groups for collective action. The process of stakeholders’ communication can be understood by interpreting the structure of the network in which stakeholders operate. Our study attempted to identify stakeholders, determine the structure of their relationships through a social network analysis and examine how network structure could aid collaborative efforts towards invasive species management. We used organizational network analysis, a web-based program, to collect network data for conservation groups on Waiheke Island, New Zealand. Response rate was 47% of the 103 contacts made and thirty-five conservation groups were identified. Results revealed low density, high non-reciprocity, and high centrality among a few stakeholders in the network suggesting a non-cohesive network. We identify how influential stakeholders could carefully initiate and strengthen collaborations that might lead to collective invasive species management action after a thorough examination of mandated, funded or shared interest relationships.