This volume of the journal collected papers represented at the 9th International Conference on Material Science and Engineering Technology (ICMSET 2020), the 9th International Conference on Nanostructures, Nanomaterials and Nanoengineering (ICNNN 2020), and the 5th International Conference on Materials Technology and Applications (ICMTA 2020), 9-11 October 2020, Kyoto, Japan. The papers provide the readers with an overview of many recent advances in the fields related to materials science and engineering technology, including modeling, analysis, computation, and optimization procedures, as well as experimental methods of the research.