The advent of nanoparticles has transformed the field of biosensors, particularly immunosensors, which rely on specific interactions between antigens and antibodies. The physicochemical characteristics, such as tunable size, versatile functionalization, and high surface area, enable their integration into immunosensors. They have emerged as pivotal catalysts in the realm of immunosensor innovation, offering transformative potential in clinical diagnostics, environmental monitoring, and food safety. Nanoparticles, including carbon, gold, silver, and magnetic (MNP) materials, have been extensively studied for their catalytic properties, which can be harnessed to amplify detection signals. In addition, their superior electrical conductivity and antimicrobial properties have further contributed to the development of highly sensitive immunosensors. Different techniques, such as self-assembly, covalent binding, or electrostatic adsorption, have been employed for the integration of nanoparticles into immunosensors, involving surface functionalization with biological recognition elements, such as antibodies and aptamers. Additionally, the use of nanoparticles allows for the design of multianalyte sensors, which is crucial for comprehensive diagnostic applications. Nanoparticle-catalyzed immunosensors hold a prominent future, with ongoing research focusing on enhancing their stability, reproducibility, and real-time monitoring capabilities. Continued innovation and research in this field will undoubtedly lead to more robust, reliable, and versatile immune-sensing platforms, ultimately benefiting a wide range of scientific and industrial applications.