BackgroundAdolescents with high autistic traits in the general population are at increased risk of depression. Despite the importance of help-seeking for early intervention, evidence on help-seeking intentions among this population is scarce.AimsTo examine the help-seeking intentions and preferences for depression by the level of autistic traits in adolescents, and test how help-seeking intentions mediate the association between autistic traits and depressive symptoms.MethodParticipants were from the Tokyo Teen Cohort, a population-based cohort in Japan. They were classified into two groups according to parent-rated autistic traits measured by the short-version of the Autism-Spectrum Quotient (≥6 as AQhigh). Help-seeking intentions and preferences were assessed at age 12 using a depression vignette. Depressive symptoms were self-rated at age 14 using the Short Mood and Feelings Questionnaire. Data were analysed using multivariable regression analysis and structural equation modelling.ResultsOf the 2,505 adolescents in the study, 200 (8%) were classified as AQhigh. In the AQhigh-group, 40% of the adolescents reported not having help-seeking intentions, although 93% recognised the need and 97% had someone to rely on. Parents of the AQhigh-group also reported fewer help-seeking intentions. The AQhigh-group was associated with an increased risk of not having help-seeking intentions (OR 1.83, 95%CI 1.35–2.49), which explained 19% of the above association.ConclusionsLower help-seeking intentions among adolescents with high autistic traits partially explained their increased risk for subsequent depressive symptoms. Interventions to promote help-seeking intentions among this population should involve both adolescents and their parents and ideally be provided before adolescence.