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, V¿¿¿ine Pr¿düti¿n ¿nd Immuniz¿ti¿n. Drug Delivery, Delivery of Vaccine Antigens, Antigen Resistance, Immunogenicity, Disease Diagnosis.