In this article, we present the most up-to-date, fine-grained, global dataset on external support in armed conflicts: theUCDP External Support Dataset (ESD). The dataset encompasses data on states and non-state actors as bothsupporters and recipients and provides detailed information on the type of support provided to warring parties inarmed conflicts between 1975 and 2017. We use it to highlight three broader trends in the provision of externalsupport: (1) a dramatic increase in the number of external supporters, (2) a larger share of pro-government interventions, and (3) the rise of direct military intervention as the predominant mode of external support. In conclusion,we identify several avenues worthy of future inquiry that could significantly improve our understanding of externalsupport in armed conflicts.