The book presents recent advances in the field of nanoenzymes and the immobilization of enzymes in nanomaterials. Applications include disease diagnosis, environmental clean-up, biosensor manufacturing, drug delivery and vaccine production. Keywords: Nanoenzymes, Metal and Metal Oxide Nanoparticles, Carbon Nanotubes, Graphene, Activated Carbon, Enzyme Immobilization, Catalytic Activity, Leaching of the Enzyme, Enzyme Mimicking, Biosensors, Biosensing Mechanisms, Therapeutic Applications, VĐ°ŅŅine PrĐžduŅtiĐžn Đ°nd ImmunizĐ°tiĐžn. Drug Delivery, Delivery of Vaccine Antigens, Antigen Resistance, Immunogenicity, Disease Diagnosis.