This volume constitutes the thoroughly refereed proceedings of the 8th International Workshop on Agent-Oriented Software Engineering, AOSE 2007, held in Honolulu, Hawaii in May 2007 as part of AAMAS 2007. The 16 revised full papers were carefully selected from numerous submissions during two rounds of reviewing and improvement. The volume contains the papers presented at the workshop, together with papers resulting from discussions on tools and platforms. The papers have been organized into four sections on: methodology and processes, interacting heterogeneous agents, system development issues, and tools and case studies.