This book presents selected papers from the 8th International Conference on Mechanical Engineering Research (ICMER 2025), held in Kuala Lumpur, Malaysia, on August 7–8, 2025. The papers present cutting-edge research and technological advancements in mechanical engineering covering four major topics: (1) Innovative materials—Advances in materials development, coatings, nanomaterials, composites, lubricants, corrosion resistance, surface modification, and semisolid metal processing that enhance material performance, durability, and functionality; (2) Frontier manufacturing—Studies on advanced fabrication, welding, laser processing, additive manufacturing, device development, instrumentation, and manufacturing technologies for modern engineering applications; (3) Thermal management—Investigations on heat transfer, cooling systems, thermal storage, nanofluid boiling, HVAC-related performance, and flow visualization for improved thermal system efficiency; (4) Structural and mechanical engineering—Research on finite element analysis, structural behaviour, fracture, durability, damage detection, composite structures, fatigue, topology optimization, and impact resistance. This volume is an essential reference for postgraduate students, academics, and professionals in mechanical engineering and related fields. Addressing key advances in materials, manufacturing, thermal systems, and structural engineering, it offers insights into emerging trends, innovative solutions, and future directions shaping mechanical engineering and industrial applications worldwide.