This book constitutes the refereed proceedings of the Workshops from the 15th International Conference on Green, Pervasive, and Cloud Computing, GPC 2020, held in Xi'an, China, in November 2020. Due to the COVID-19 pandemic this event was held virtually. The 5 full papers presented in this book together with 3 short papers were carefully reviewed and selected from 16 submissions. They present recent research in the areas of urban computing, intelligent transportation and social computing.