This book constitutes the refereed proceedings of the 56th International Conference on Asia Pacific Advanced Network, APANConf 2023, held in, Colombo, Sri Lanka, during August 24-25, 2023. The 10 full papers and 1 short papers included in this book were carefully reviewed and selected from 37 submissions. They are organized in topical sections as follows: artificial intelligence and machine learning, accelerated computing and distributed systems and communications and networking.