This collection covers innovations in the field of composite materials with a specific focus on merging advanced functionality with eco-friendly and environmentally sustainable systems. All composite fields are explored, including polymer, metal, and ceramic matrix composites with an emphasis on sourcing raw materials in a sustainable way, developing sustainable manufacturing methods, and developing composite materials for environmental sustainability. Topics include the development of new materials for structural applications, reduction in energy consumption, and increased component life along with discussions of novel methods to reuse existing materials. Additional topics include but are not limited to: Naturally sourced materials feedstock Recycled materials feedstock Application of composite materials for reduced carbon footprint Development of novel materials to repurpose waste from other areas Eco-nanomaterials/nanocomposites Selected rapid prototyping