['This study examined prevalence and correlates of mental health service use among adolescents with an autism spectrum disorder.', 'Data from the National Longitudinal Transition Study-2 were used to examine mental health service use among 920 youths with this disorder. Estimates are nationally representative of students enrolled in the special education autism category. Regression models examined the association of predisposing, enabling, and need factors with service use overall and with a focus on receiving these services at school.', 'Overall, 46% (weighted) of the youths had used a mental health service in the past year. Of those who had, 49% (weighted) had received it at school. Need variables were the strongest correlates of service use. African-American youths and youths from lower-income families were more likely to receive school-based services.'] Do mental health service use among adolescents with an autism spectrum disorder?