This book constitutes the proceedings of the 19th International Conference on Coordination Models and Languages, COORDINATION 2017, held in Neuchâtel, Switzerland, in June 2017, as part of the 12th International Federated Conference on Distributed Computing Techniques, DisCoTec 2017. The 13 full papers included in this volume were carefully reviewed and selected from 31 submissions. The papers cover a wide range of topics and techniques related to system coordination, including: languages and tools; types; resource, components and information flow; verification.