This volume provides an opportunity for the readers to engage with a selection of peer-reviewed full text papers presented at the 11th International Conference on Key Engineering Materials (ICKEM 2021, Moscow, Russian Federation, on 26-29 March 2021). The topics of collected papers include the building materials, their properties, and their use in modern construction; composites, ceramics, and polymers; electrotechnical materials; metallic materials processing, and biochemical engineering.