This book constitutes the proceedings of the 8th European Conference on Software Architecture, ECSA 2014, held in Vienna, Austria, in August 2014. The 16 full papers and 18 short papers presented in this volume were carefully reviewed and selected from 91 submissions. They are organized in topical sections named: architecture decisions and knowledge; architecture patterns and anti-patterns; reference architectures and metamodels; architecture description languages; enterprise architecture, SOA and cloud computing; components and connectors; quality attributes; and architecture analysis and verification.