Description:This book constitutes the strictly refereed post-proceedings of the 5th International Workshop on Computational Logic for Multi-Agent Systems, CLIMA V, held in Lisbon, Portugal, in September 2004 as a joint event in federation with the Ninth European Conference on Logics in Artificial Intelligence (JELIA’04) to promote the CLIMA research topics in the broader community of logics in AI. The 16 revised full papers presented were carefully selected from 35 submissions and are devoted to techniques from computational logic for representing, programming, and reasoning about multi-agent systems. The papers are organized in topical sections on foundations, architectures, interaction, and planning and applications.