This book constitutes the refereed proceedings of the 9th International Symposium on Ubiquitous Networking, UNet 2023, held in Clermont-Ferrand, France, during November 01–03, 2023.

The 14 full papers included in this book were carefully reviewed and selected from 28 submissions. They were organized in topical sections as follows: artificial intelligence-driven communications; data engineering, cyber security and pervasive services; tactile internet and internet of things; ubiquitous communication technologies and networking.