The Ocean covers two-third of our planet and has great biological heterogeneity. Marine organisms like algae, vertebrates, invertebrates, and microbes are known to provide many natural products with biological activities as well potent sources of biomaterials for therapeutic, biomedical, biosensors, and climate stabilization. Over the years, the field of biosensors have gained huge attention due to their extraordinary ability in providing early diseases diagnosis and treatment as well as environmental pollutants. This review focuses on various biomaterials (Carbohydrtae polymers, proteins, polyacids etc) of marine origin such as Alginate, Chitin, Chitosan, Fucoidan, Carrageenan, Chondroitin Sulfate (CS), Hyaluronic acid (HA), Collagen, marine pigments, marine nanoparticles, Hydroxyapatite (HAp), Biosilica, lectins, and marine whole cell. Further, it mentions the source of such marine biomaterials and their promising evolution for the development of biosensors that are potent to be employed in the biomedical, environmental science and agricultural sciences domains.