This book constitutes the refereed proceedings of the 19th International Conference on Web Information Systems and Technologies, WEBIST 2023, held in Rome, Italy, during November 15-17, 2023. The 5 full papers and 8 short papers included in this book were carefully reviewed and selected from 77 submissions. The selected papers contribute to the understanding of relevant trends of current research on Web Information Systems and Technologies, including: Human Computer Interaction, Application, Research Project and Internet Technology, UX and User-Centric Systems, Web Programming, Web Tools and Languages, Applications, Research Projects and Web Intelligence, Natural Language Processing, Human Factors, Web Information Filtering and Retrieval and Web Interfaces and Applications.