This volume contains papers that were presented at the 4th International Conference on Materials Sciences and Nanomaterials (ICMSN 2020), the 5th International Conference on Advanced Functional Materials (ICAFM 2020), and the 3rd International Conference on Advanced Composite Materials (ICACM 2020). These conferences were held 8-10 July 2020, virtually in web streaming. Collected articles present scientific research and engineering design results in the area of materials sciences, building materials, and advanced technologies of materials processing.