This book comprehensively reviews the theranostic applications of nanomaterials against various neurological disorders. The initial chapters briefly introduce various neurological disorders, their molecular mechanism, available treatments, and the latest research. It further reviews the challenges associated with the current theranostics strategies, including blood-brain-barrier. This book examines the synthesis of nanoparticles, development of efficient biosensors, fabrication of nanomaterials, diagnosis through nano-chips, and their interaction with neuronal cells. The chapter also discusses the various nanoformulations or nanocarriers of natural therapeutics, including herbal products, peptides, nootropics, and dietary supplements used to prevent and delay neurological disorders. Additionally, the book provides information on the commonly used molecular imaging tools and biosensors, using different nanomaterials for the early detection of neurological disorders. Towards the end,the book covers the imaging techniques like gold nanocages and photoacoustic imaging for diagnosing and targeted drug delivery for neurological disorders. The chapter presents the current challenges in using nanotechnology for neurological disorders and their potential solutions.