This book constitutes the refereed proceedings of the 28th IFIP WG 6.1 International Conference on Coordination Models and Languages, COORDINATION 2026, held in Urbino, Italy, during June 8–12, 2025, as part of the 21st International Federated Conference on Distributed Computing Techniques, DisCoTec 2026.The 11 full papers, together with 2 tool papers,included in this book were carefully reviewed and selected from 28 submissions. This conference provides a well-established forum fo...