The study of brain disorders has long been central to both neurology and psychiatry, with these two disciplines evolving as distinct yet deeply interconnected fields. In fact, these specialties often share overlapping symptoms, neural pathways, and treatment modalities, making interdisciplinary collaboration essential. Despite this, such collaborations remain sparse, particularly in clinical settings, research, training, and policy development. The increasing global burden of brain disorders has induced a paradigm shift, emphasizing the need for cooperative efforts to preserve brain health. Effective interdisciplinary collaborations between neurology and psychiatry as well as with other partners involved in brain health and other medical specialties is crucial to improving patient outcomes and societal well-being. Furthermore, the development of comprehensive training programs in brain health is vital, aligning with the recent rise in brain medicine as a unified field. This article reviews the historical evolution of neurology and psychiatry, explores current synergies, and identifies areas for future collaboration, particularly in enhancing research, education, and shared preventative strategies. Ultimately, fostering interdisciplinary collaboration between neurology and psychiatry along with other medical specialties and relevant partners will be key to advancing brain health and addressing the global burden of brain disorders.