A population-level study of mental health service data has shown that Māori youth are less likely to be identified for anxiety and depression, and more likely to be identified for substance use and self-harm, compared with non-Māori/non-Pasifika (NMNP) youth. The study used the Integrated Data Infrastructure to identify 232,845 Māori and 627,891 NMNP aged 10–24 years. Adjusted risk ratios for identification of anxiety and depression in Māori were 0.88 (95% CI 0.85-0.90) and 0.92 (95% CI 0.90-0.95), respectively, compared with NMNP. Adjusted risk ratios for identification of substance problems and self-harm were 2.66 (95% CI 2.60–2.71) and 1.56 (95% CI 1.50–1.63), respectively. Compared with Māori living in least deprived areas, those living in high deprivation areas were significantly more likely to be identified for substance problems and less likely to be identified for anxiety and depression.