This book constitutes the thoroughly refereed post-conference proceedings of the 8th International Workshop on Computational Logic for Multi-Agent Systems, CLIMA VIII, held in Porto, Portugal, in September 2007 - co-located with ICLP 2008, the International Conference on Logic Programming.The 14 revised full technical papers and 1 system description paper presented together with 1 invited paper were carefully selected from 33 submissions and went through at least two rounds of reviewing and improvement. The regular papers address topics such as interdependencies and co-ordination of task-based planning in multi-agent systems, interval temporal logic, game theoretic concepts for reasoning about rational agents, proof theory for multi-agent epistemic logic, transformational semantics for evolving logic programs (EVOLP), programming languages based on BDI models, agent oriented early requirements engineering framework, heuristic algorithms for agent negotiation, as well as argumentation.