This book constitutes the proceedings of the 11th International Workshop on Computational Logic in Multi-Agent Systems, CLIMA XI, held in Lisbon, Portugal, in August 2010. The 14 papers presented were carefully reviewed and selected from 31 submissions. In addition 4 invited talks are presented. The purpose of the CLIMA workshops is to provide a forum for discussing techniques, based on computational logic, for representing, programming and reasoning about agents and multi-agent systems in a formal way. This volume features two thematic special sessions: norms and normative multi-agent systems and logics for games and strategic reasoning.