This book encompasses the collective wisdom and groundbreaking insights presented on 2025 International Conference on Functional Materials and Chemical Engineering (ICFMCE 2025), held in Kuala Lumpur, Malaysia, during November 23-25, 2025. It delves into the cutting-edge realm of materials engineering, nanomaterials and nanotechnology, functional materials, energy materials, composite materials, biomaterials, materials properties and characterization, chemical engineering, providing novel insights, and profound discussions on its fundamental principles and application. It can be an instructive resource for researchers, engineers, and practitioners involved in the field of materials science and chemical engineering.