Biopolymer-based nanocomposites have gained significant attention in biomedicine due to their unique properties and potential applications. These nanocomposites combine biopolymers, natural polymers derived from renewable sources, with nanoparticles or other nanoscale materials to create materials with enhanced properties and functionalities. Biopolymers such as cellulose, alginate, chitosan, starch, polylactic acid (PLA), polyhydroxyalkanoate (PHA), and polyhydroxybutyrate (PHB) are used to make bionanocomposites. These materials have different properties and can be used in various treatments, including scaffolds, hydrogel films for anticancer treatment, and drug delivery systems. Nanocomposites like silver nanoparticles with chitosan, sulfated polysaccharides, and thyme-loaded carrot nanocellulose or starch biopolymer nanocomposites have been used to stop bacterial development. This review provides a comprehensive insight into biopolymer-based nanocomposites and their uses, including applications in biosensors, bioimaging, blood clotting, immunomodulation, antibacterial and antiviral drugs, and food packaging. The primary objective of this review is to provide an overall perspective on biopolymer nanocomposites in nanomedicine. The review discusses the synthesis techniques of nanocomposites, their advantages and disadvantages, and their applications in various biomedical fields. It also highlights the importance of biopolymer nanocomposites in tissue engineering, drug delivery, wound healing, and other medical applications. The review emphasizes the potential of biopolymer-based nanocomposites in addressing challenges in biomedicine and their role in developing new and effective medical treatments.Biopolymer-based nanocomposites have gained significant attention in biomedicine due to their unique properties and potential applications. These nanocomposites combine biopolymers, natural polymers derived from renewable sources, with nanoparticles or other nanoscale materials to create materials with enhanced properties and functionalities. Biopolymers such as cellulose, alginate, chitosan, starch, polylactic acid (PLA), polyhydroxyalkanoate (PHA), and polyhydroxybutyrate (PHB) are used to make bionanocomposites. These materials have different properties and can be used in various treatments, including scaffolds, hydrogel films for anticancer treatment, and drug delivery systems. Nanocomposites like silver nanoparticles with chitosan, sulfated polysaccharides, and thyme-loaded carrot nanocellulose or starch biopolymer nanocomposites have been used to stop bacterial development. This review provides a comprehensive insight into biopolymer-based nanocomposites and their uses, including applications in biosensors, bioimaging, blood clotting, immunomodulation, antibacterial and antiviral drugs, and food packaging. The primary objective of this review is to provide an overall perspective on biopolymer nanocomposites in nanomedicine. The review discusses the synthesis techniques of nanocomposites, their advantages and disadvantages, and their applications in various biomedical fields. It also highlights the importance of biopolymer nanocomposites in tissue engineering, drug delivery, wound healing, and other medical applications. The review emphasizes the potential of biopolymer-based nanocomposites in addressing challenges in biomedicine and their role in developing new and effective medical treatments.