This book constitutes the refereed proceedings of the 8th International Workshop on Deontic Logic in Computer Science, DEON 2006, held in Utrecht, Netherlands in July 2006. The 18 revised full papers presented together with the abstracts of 3 invited talks were carefully reviewed and selected for inclusion in the book. The papers are devoted to the relationship between normative concepts and computer science, artificial intelligence, philosophy, organization theory, and law. In addition to these topics, special emphasis is placed on artificial normative systems, their theory, specification and implementation, such as electronic institutions, norm-regulated multi-agent systems and artificial agent societies generally.