This volume constitutes the thoroughly refereed post-conference proceedings of the Third International Conference on Ethics and Policy of Biometrics and International Data Sharing, ICEB 2010, held in Hong Kong, during January 4-5, 2010. The 25 revised full papers presented were carefully reviewed and selected for inclusion in the book. The papers are organized in topical sections on Privacy Protection and Challenges, Legal Challenges, Engineering and Social Challenges, Ethical and Medical Concerns, Policy Issues and Deployments in Asia, Challenges in Large Scale Biometrics Identification.