This book constitutes the proceedings of the 30th International Conference on Collaboration Technologies and Social Computing, CollabTech 2024, held in Barcelona, Spain, during September 11–14, 2024.  The 12 full papers and 10 short papers included in this book were carefully reviewed and selected from 85 submissions. The papers present up to date research on theory, models, design principles, methodologies, and case studies that contribute to a better understanding of the complex interrelations between collaboration and technology.