Nanocomposite biomaterials represent an advanced approach that combines natural materials with nanotechnology to create materials with enhanced properties for medical and healthcare applications. The amalgamation of nature’s adaptability with the precision of nanotechnology presents novel opportunities for innovation in the biomedical sector. Biocompatibility is a crucial characteristic for any material intended for biomedical use, particularly nanobiomaterials, as it refers to the material’s ability to interact with biological systems without causing adverse effects while fulfilling its intended purpose. Metal nanocomposites are revolutionising biomedical applications by offering innovative solutions for drug delivery systems, biosensors, imaging agents, and scaffolds for tissue engineering and antibacterial treatments. New applications in neurotherapy, photodynamic therapy, and stem cell therapy underscore their potential to address complex medical challenges.