This book constitutes the refereed proceedings of the 9th Global Symposium on Smart Computing and Systems, G3S 2025, held in Beni Mellal, Morocco, during November 27-29, 2025.
The 30 full papers included in this book were carefully reviewed and selected from 81 submissions. They were organized in topical sections as follows: Intelligent Models and Smart Decision Systems; Connected Intelligence and Distributed Architectures; and Secure, Trusted, and Data-Driven Ecosystems.