This book constitutes the refereed proceedings of the 16th International Conference on Quality of Information and Communications Technology, QUATIC 2023, held in Aveiro, Portugal, during September 11–13, 2023.The 17 full papers and 4 short papers included in this book were carefully reviewed and selected from 37 submissions. They were organized in topical sections as follows: Disseminating Advanced Methods, Techniques, and Tools for Supporting Quality ICT Engineering and Management Approaches.