This book constitutes the refereed proceedings of the 19th International Conference on Mobile Web and Intelligent Information Systems, MobiWIS 2023, held in Marrakech, Morocco, during August 14-16, 2023.The 18 full papers and 1 short papers presented in this book were carefully reviewed and selected from 54 submissions. The papers are divided into the following topical sections: smart and intelligent systems; digital systems in healthcare services; SDN, IoT and edge computing; mobile interfaces and interactivity; machine learning and stochastic methods; and advanced mobile applications.