We are very pleased to introduce the results of the 8th International Conference on Key Engineering Materials (8th ICKEM 2018). The conference was held in Osaka, Japan during March 16-18, 2018 and focused on research in the area of polymers and composites, nanomaterials and biomaterials, functional materials, materials in electronic engineering, surface engineering and coatings, electrochemistry; environmental and chemical engineering, alloys, steel, technologies of machining and metal recovery, materials mechanics and structural mechanics, building materials.