This volume presents the papers contributed to DEON 2006, the 8th Inter- tional Workshop on Deontic Logic in Computer Science, held in Utrecht, The Netherlands, July 12-14, 2006. These biennial DEON (more properly, ?EON) workshops are designed to promote international cooperation among scholars across disciplines who are interested in deontic logic and its use in computer science. They support research that links the formal-logical study of normative concepts and normative systems with computer science, arti?cial intelligence, philosophy, organization theory, and law. Papers for these...