The Douglas-Bell Canada Brain Bank (DBCBB) is the largest brain bank in Canada, established in 1980. Its primary mission is to provide qualified researchers worldwide with valuable human brain tissues and associated clinical and developmental data to advance fundamental research on mental illness and neurodegenerative diseases. It is a critical resource for understanding the biological underpinnings of complex brain disorders. The DBCBB manages a comprehensive relational database that includes demographic, clinical, and developmental histories from its donors. The bank is equipped with high-capacity ultra-low freezers, advanced microscope and slide scanning technology, and automated specimen identification processes, ensuring optimal preservation and meticulous characterization of all tissues. Uniquely in North America, it collects brains from individuals with a wide range of mental disorders, such as schizophrenia, major depression, bipolar disorder, and substance use disorders, as well as neurodegenerative diseases like Parkinson's, Alzheimer's, and amyotrophic lateral sclerosis (ALS), including samples from individuals who died by suicide. This invaluable resource supports diverse research applications, enabling scientists to investigate the causes and potential treatments of neurological and psychiatric illnesses by providing direct access to cells, proteins, and genes implicated in these conditions. Samples from the DBCBB have been instrumental in numerous scientific breakthroughs, leading to publications in high-impact journals. It facilitates studies on neurobiological processes, including brain gene expression, histological changes, epigenetics, and the long-term consequences of early-life adversity. Annually, the bank distributes between 1,000 and 2,000 brain samples to the global scientific community. Further enhancing its utility, the DBCBB maintains a crucial collaboration with the Québec Coroner's Office, which provides access to brains from individuals who died by suicide, along with carefully matched control samples. This partnership includes extensive psychological autopsy data, providing detailed clinical information that, when combined with tissue samples, offers unparalleled insights into mental disorders and suicide. The bank also actively participates in initiatives such as Autism BrainNet, contributing to and promoting research on autism spectrum disorder (ASD) and related neurodevelopmental conditions.