This book compiles the papers on Ship Motions, Hydrodynamics and Propulsion, presented at the 20th International Congress of the International Maritime Association of the Mediterranean (IMAM 2025), held in Chania, Greece, from September 28 to October 3, 2025. Organized biennially or triennially in Mediterranean-adjacent countries, IMAM congresses are pivotal events in the international maritime industry. They foster the development of innovative solutions for maritime transport and the sustainable exploitation of sea resources in the Mediterranean region. Explore the latest advancements and strategies for achieving sustainable growth in the maritime sector through this comprehensive collection of research and insights.