This book constitutes the refereed proceedings of the 9th EAI International Conference on Future Access Enablers for Ubiquitous and Intelligent Infrastructures, FABULOUS 2025, held in Stará Lesná, Slovakia, during October 8–10, 2025.The 10 full papers included in this book were carefully reviewed and selected from 27 submissions. They are organized into the following topcial sections: Future access networks; Sustainable Communications & Computing Infrastructures; and Smart Environment Applications and Scenarios.