Surface functionalized magnetic nanoparticles (MNPsMagnetic Nanoparticles (MNPs)) have revolutionized their utility aspects in drug delivery, catalysisCatalysis, multimodal imaging, etc. It has emerged its progression in a discernible phase corresponding to its distinctive advancements and paradigm shifts. Numerous techniques involving organic coating and ligand exchange marked its foundational stepping stones leading to innovations. We herein present an array of impressive strategies to synthesize functionalized magnetic nanoparticlesMagnetic Nanoparticles (MNPs) encompassing the innovative advancements to tailor MNPMagnetic Nanoparticles (MNPs) surfaces thereby highlighting their role in diverse applicationsApplications. The strategies include inorganic encapsulations, organic coating, self-assembly, ligand-engineering, bioconjugation, etc. These approaches not only impact the performance of functionalized MNPsMagnetic Nanoparticles (MNPs) but also increase the efficacy in MRIMagnetic Resonance Imaging (MRI) contrast, targeted imagingTargeted imaging, and potential applicationsApplications in catalysisCatalysis. This chapter surveys the recent advancements in terms of functionalized MNPsMagnetic Nanoparticles (MNPs) by assessing the underlying applicationsApplications, principles, and a promising forward-looking perspective in shaping science, technology, engineering, and medicine.