ABSTRACT Objectives To produce national clinical norms for WASC-Y, examine the internal consistency of the WASC-Y scales, compare scores from a clinical sample with previously published community sample data, and test the degree to which other scales predict the Suicide Scale. Method We analysed WASC-Y data from 1226 Aboriginal youth who had presented to mental health services between 2007 and 2022 and compared their scores to the original community norms. Results Our sample shows a higher level of mental health risk than does the normative sample that varied according to gender. We found high levels of suicidal behaviour in the clinical sample: 41.5% admitted to thoughts of suicide and 25.0% reported one or more suicide attempts. One in 23 reported a high likelihood that they would attempt suicide again. Knowing someone who has suicided was associated with higher Suicide Risk. Linear modelling showed that Suicide Risk is predicted by a combination of all other WASC-Y scales and gender, with females at higher risk than males. There is emerging evidence that Cultural Resilience provides some mitigation of Suicide Risk. Conclusions Our data provide the first culturally and psychometrically valid national mental health profile of Aboriginal youth accessing mental health services, including separate clinical norms for males and females. Aboriginal youth present with serious levels of suicide and mental health risk that urgently require improved access to clinically and culturally competent services. Our findings provide evidence of construct validity, in that scale scores showed meaningful associations with each other and with other variables in expected ways.