This book constitutes the refereed proceedings of the 17th BenchCouncil International Symposium on Benchmarking, Measuring, and Optimizing, Bench 2025, held in Chengdu, China, during December 3–4, 2025. The 19 full papers presented in this volume were carefully reviewed and selected from 42 submissions. They are grouped into the following topics: methodologies, and engineering practices across disciplines, including computer science, artificial intelligence, systems and infrastructure.