This book constitutes the refereed proceedings of the 11th International Conference on Global Security, Safety and Sustainability, ICGS3 2017, held in London, UK, in January, 2017. The 32 revised full papers presented were carefully reviewed and selected from 74 submissions. The papers are organized in topical sections on the future of digital forensics; cyber intelligence and operation; information systems security management; systems security, safety, and sustainability; cyber infrastructure protection.