This book constitutes the refereed proceedings of the 6thInternational Conference on E-Democracy, E-Democracy 2015, held in Athens,Greece, in December 2015.The 13 revised full paperspresented together with 8 extended abstracts were carefully selected from 33submissions. The papers are organized in topical sections on privacy ine-voting, e-polls and e-surveys; security and privacy in new computingparadigms; privacy in online social networks; e-government ande-participation; legal issues. The book also contains the extendedabstracts describing progress within European research and development projectson security and privacy in the cloud; secure architectures andapplications; enabling citizen-to-government communication.