This panel seeks to shed light on this less researched field of analysis. It aims to answer three overarching questions. First, on which kind of activities and practices, ideas and beliefs is this form of civic solidarity based on? Second, what are the contextual factors that matter in promoting or inhibiting transnational solidarity at the individual and organizational level; i.e., what is the effect of legal, political, administrative or economic contexts in the various countries? And finally, how sustainable is this form of civic solidarity across time; i.e., can we identify issues or actors that are able to subsist? The panel recruits a number of papers addressing these issues from a conceptual and empirical perspective. Contributions are based on ongoing research projects that have assembled a unique set of systematic data on civic solidarity in various European countries.