This nationally-representative, face-to-face survey examined aspects of high frequency mental disorders including mood disorders, anxiety disorders, and alcohol and drug abuse disorders. A version of the Composite International Diagnostic Interview (CIDI 3.0), amended for use in the World Health Organisation, World Mental Health Survey Initiative was used. This report presented the data from over 2500 Mäori surveyed. Prevalence of mental disorders was high for Mäori (12-month prevalence 29.5%). Severity was described as moderate or severe for 75% of illnesses occurring in the past 12 months. High rates of co-morbid mental and chronic physical disorders were also described. Rates of significant suicidal thinking (3.8 %), suicidal plans (1.3%) and suicide attempts (0.7%) were significant. However uptake of specific health or other services was low.