Carbon-based nanofillers such as graphene, carbon nanotubes, etc. have been extensively explored recently. This is because these nanofillers assist in improving the mechanical, electrical, and thermal properties of polymer composites. This Reprint provides insight into recent advances in present research activities on material science, manufacturing techniques, and their multi-functionality within polymer composites. With the advancement of research, new novel materials are expected, with a special focus on ongoing challenges in present scenarios. Therefore, this Reprint will provide readers with up-to-date literature on the research on nanofillers-based polymer composites, their current scenarios, and the future prospects of the work in this area.