Okwudili Simeon Ogbonna (O.S. Ogbonna) is a Nigerian academic and researcher specializing in materials science and mechanical engineering. He currently serves as Lecturer I in the Faculty of Engineering at the State University of Medical and Applied Sciences (SUMAS) in Enugu State, Nigeria. His research primarily focuses on mechanical characterization, optimization of manufacturing processes (especially MIG, TIG, and hybrid welding), titanium alloys, dissimilar metal joining, nanomaterials, and composites for industrial and automotive applications.