this book constitutes the proceedings of the 8th international workshop on programming multi-agent systems held in toronto, canada, in may 2010 in conjunction with aamas 2010, the 9th international joint conference on autonomous agents and multiagent systems. the 7 revised full papers presented together with 1 invited paper were carefully reviewed and selected for inclusion in the book. the papers cover a broad range of mostly practical topics like decision component of agent systems practical examples of programming languages interaction with the environment, and are thus organized in topical sections on reasoning, programming languages, and environments.