This volume presents peer-reviewed contributions from the International Conference on Computational Dynamic Soil-Structure Interaction (CompDSSI), held in Riva del Garda, Italy on July 1-3, 2026. The event brought together scientists, researchers, and practitioners, providing a forum for discussing and disseminating the latest developments and achievements in all major aspects of computational dynamic soil-structure interaction, including numerical approaches for analysing the dynamic response of soil-structure systems, SSI-informed assessment, design and protection of structures and infrastructures against natural hazards, dynamic performance and resilience of energy soil-structure systems, surrogate modelling and uncertainty quantification in the dynamic performance of soil-structure systems.