This book constitutes the proceedings of the 20th International Conference on Soft Computing Models in Industrial and Environmental Applications, SOCO 2025, held in Salamanca, Spain, during October 16-17, 2025.

The 60 full papers included in this volume were carefully reviewed and selected from 133 submissions. The papers cover the following topical sections: Optimization, Metaheuristics and Applied Math; Deep Learning for Environmental, Energy and Bio-Vision Applications; Anomaly Detection and Predictive Maintenance. The papers also include the following special sessions: Time Series Forecasting in Industrial and Environmental Applications; Efficiency and Explainability in Machine Learning and Soft Computing; Intelligent Techniques Applied to Modelling and Control in Engineering focused on marine energy systems and robotics; Quantum Computing; EUropean Transnational Educational; and Machine Learning and Computer Vision in Industry 4.0.