Book excerpt: This report is designed to raise the profile of mental illness in Canada among government & non-governmental organizations and the industry, education, workplace, & academic sectors. It describes major mental illnesses and outlines their incidence & prevalence, causation, impact, stigma, and prevention & treatment. Data presented are based on currently available provincial studies & data on mortality and hospitalizations. Five mental illnesses have been selected for inclusion in the report by virtue of their high prevalence rates or because of the magnitude of their health, social, & economic impact: mood disorders, schizophrenia, anxiety disorders, personality disorders, and eating disorders. While not in itself a mental illness, suicidal behaviour is also included since it is highly correlated with mental illness and raises many similar issues. The appendix includes information on data sources and a call for action on building consensus for a national action plan on mental illness & mental health.