This contributed volume discusses advanced applications of functionalized magnetic nanomaterials (FMNs) across biomedical and industrial sectors, exploring their innovative uses in drug delivery, diagnostic imaging, water treatment, and energy technologies. It highlights the interdisciplinary nature of FMNs, examining their roles in cancer treatment, biosensing, and waste management, while also addressing regulatory, economic, and safety aspects. Through case studies and a focus on future trends, the book provides a comprehensive understanding of FMNs' potential to transform various fields. The intended audience includes researchers, professionals, and students in materials science, biomedical engineering, environmental science, and industrial technology.