This book constitutes the refereed proceedings of the 20th International Conference on Mobile Web and Intelligent Information Systems, MobiWIS 2024, held in Vienna, Austria, during August 19–21, 2024.

The 21 full papers and 1 short paper included in this book were carefully reviewed and selected from 65 submissions. They were organized in topical sections as follows: IoT, networks and cloud services; AI, blockchain and security; blockchain techniques and technologies; AI-based applications; and smart cities and knowledge management.