This proceedings contains 78 papers from the 8th International Conference on High Temperature Ceramic Matrix Composites, held September 22-26, 2013 in Xi'an, Shaanxi, China. Chapters include: • Ceramic Genome, Computational Modeling, and Design • Advanced Ceramic Fibers, Interfaces, and Interphases • Nanocomposite Materials and Systems • Polymer Derived Ceramics and Composites • Fiber Reinforced Ceramic Matrix Composites • Carbon-Carbon Composites: Materials, Systems, and Applications • Ultra High Temperature Ceramics and MAX Phase Materials • Thermal and Environmental Barrier Coatings