Organisational Network Analysis (ONA) has received considerable attention in recent years within People Analytics circles globally, ONA traditionally denotes the analysis of social interactions internally to inform organisational decision making. However there have been some exceptional examples of the insights that can be derived when ONA is applied to open source (publicly available data). There is great value in moving from a purely internal network view (a potential limitation of Organisational Network Analysis) to a view that includes external network analysis and when applied to a variety of datasets network analysis can generate unique people analytics insights for organisations. In this article Adam McKinnon and André Vermeij focus on how HR can inform decision making by applying network analysis to open data, sharing practical use cases and examples.