Nanotechnology in aerospace has brought about a significant transformation in materials science, leading to the creation of advanced materials with improved properties. This section delves into the emerging field of green nanoparticles and nanocomposites for aerospace applications, with a particular emphasis on sustainable and environmentally friendly approaches. It explores the fundamental concepts of nanoparticles and nanocomposites, classifying them into polymer-based, metal matrix, and ceramic matrix nanocomposites commonly employed in the aerospace industry. The discussion also addresses environmental concerns associated with traditional nanomaterials, paving the way for exploring green nanoparticles derived from plant extracts, microorganisms, and other sustainable resources. In terms of practical applications in aerospace, the utilization of green nanoparticles extends to lightweight structural components, thermally conductive coatings, and advancements in electronics and sensing technologies. While highlighting the numerous benefits of green nanomaterials, the section also acknowledges the challenges and potential risks of their implementation in aerospace. Future perspectives focus on innovative trends and the continuous evolution of sustainable nanomaterials to further advance aerospace technology.