The 9th International Conference on Mechanical, Aeronautical and Automotive Engineering, will take place in Yokohama, Japan, from April 2-4, 2025. This event is sponsored by Singapore Institute of Electronics (SIE), with support from Sichuan Institute of Electronics, China, National Taiwan University of Science and Technology and Multimedia University, Malaysia. ICMAA 2025 is a not-to-be-missed opportunity, it offers an ideal opportunity for researchers, engineers, academics and students from all over the world to bring the latest technological advances and applications in mechanical, aeronautical and automotive engineering, as well as to network and promote the discipline. Cutting edge researchers in this field will present keynote speeches during a three-day program that also features tutorials and technical sessions on theory, analysis, design, testing, and advances within the field of mechanical, aeronautical and automotive engineering. The papers to be presented at ICMAA past conferences addressed many grand challenges in modern engineering.