This publication contains papers that were presented at the 8th International Conference on Composite Materials and Material Engineering (ICCMME 2023, January 6-8, 2023, Tokyo, Japan), 13th International Conference on Advanced Materials Research (ICAMR 2023, January 13-15, 2023, hybrid), and 6th International Conference on Frontiers of Composite Materials (ICFCM 2022, December 28-30, 2022, hybrid). The conference programs covered a wide range of topics related to modern materials science and materials processing technologies. This collection will be helpful to many researchers and engineers. Steel, Polymer, Composite, Ceramics, Electrochemistry, Polymer Electrolyte, Electrochemical Cell, Nanomaterials, Biomaterials, Asphalt Concrete, Furnace Slag, Additive Manufacturing, Biomass Conversion, Failure Analysis, Materials Flaw Identification Materials Science, Building Materials, Mechanics.