This book constitutes the revised selected papers from the International SpainTech-BAI 2025 Workshops held in Madrid, Terrassa, Pamplona, Benicassim, Spain, during March 19-20, 2025, May 14-15, 2025, September 25-26, 2025, and October 28-29, 2025.

The 24 full papers included in this volume were carefully reviewed and selected from 31 invited submissions from 91 extended abstracts . They provide a view of recent advances in AI, optimization, data analytics, and applied technology, and serve as a useful reference for both research and practical implementation in Spain and Europe.