This Special Issue covers various aspects of materials engineering in the topic of the fabrication of hybrid and composite materials. It mainly focuses on the novel developments of new processing methodologies for the fabrication and modification of carbon and related hybrid and composite materials for magnetic, electronics, prosthetic and optoelectronics applications. These composite and hybrid materials composed mainly of the molecular structure of fullerenes, graphene, carbon fibers and nanotubes as well as metallic nanoparticles of great potential applications in nanotechnology. The Special Issue collected ten research articles describing diverse research topics of different carbon base materials like single-wall carbon nanotubes, carbon fibers, fullerenes, multi-wall carbon boron nitride and graphene hybrids and nanocomposites. We would like to thank all authors whose contributions are included in this Special Issue for their excellent work, and for their inspiring and interesting articles.