Founded in 2012 City Health International is a network of individuals and organisations engaged in the study of and response to structural health issues and health behaviours in the urban environment. For the first time in history the majority of the world’s population now live in urban environments and the proportion continues to grow. As national governments struggle to deal with the pressures and demands of growing urban populations against a backdrop of financial deficits and uncertainty, it is increasingly left to those working at a city level to provide the leadership and support needed to tackle key health issues.