Harbours are a focus of intensive and diverse activities and thus have a high potential to become centres of conflict between users. Reviewing the multiple uses associated with harbours provides important insights into maritime communities and the management of conflict. In this paper, seven international, multi-disciplinary groups provide their expert synthesis of individual harbours. After a detailed discussion experts from Sydney, Qingdao, Vigo, Auckland, Jakarta, Crete and Plymouth synthesised and shared their harbour’s characteristics, user conflicts and how such conflicts have been researched and managed. The paper addresses an omission of “conflict” in most of the research literature about harbours, and ports and scopes a research agenda that includes integration, risk appreciation and other approaches to these increasingly contentious maritime environments. This process provided an opportunity for global researchers to share the ways harbour conflicts are mitigated and the kinds of adaptations that are possible.