This book constitutes the refereed proceedings of the 15th International Conference on Coordination Models and Languages, COORDINATION 2013, held in Firenze, Italy, in June 2013, within the 8th International Federated Conference on Distributed Computing Techniques (DisCoTec 2013). The 17 revised full papers presented were carefully reviewed and selected from 42 submissions. The papers cover a wide range of topics including coordination of social collaboration processes, coordination of mobile systems in peer-to-peer and ad-hoc networks, programming and reasoning about distributed and concurrent software, types, contracts, synchronization, coordination patterns, and families of distributed systems.