This book constitutes the refereed proceedings of the 19th International Working Conference on Requirements Engineering: Foundation for Software Quality, REFSQ 2013, held in Essen, Germany, in April 2013. The papers are organized in 8 topical sections on requirements engineering and architecture; natural language requirements; requirements engineering and quality; traceability; requirements engineering and business/goals; requirements engineering and software development; requirements engineering in practice; product lines and product management.