This book constitutes the refereed proceedings of the 19th International Conference on Blended Learning, ICBL 2026, held in Beijing, China, during July 28–31, 2026. The 36 full papers included in this book were carefully reviewed and selected from 116 submissions. They were organized in topical sections as follows: Keynotes; Collaborative Learning Innovations; Large Language Models in Education; Generative Artificial Intelligence in Education; AI-enhanced Teaching and Learning; Intelligent Educational Frameworks and Environments; Advanced Training and Curriculum Designs.