Introduction: Although research on mental health comorbidities in autism spectrum disorder (ASD) has increased in recent years, little has been done to evaluate potential individual × environment interactions associated with these comorbidities. The current study explored whether ASD-related characteristics (social-communication impairment) and environmental factors (peer and family contexts) had additive or interactive effects on the depression symptoms of youth with ASD. Method: In a cross-sectional sample of adolescents with ASD (N = 176; 13-17 years old; 72.7% male), primary caregivers and adolescents responded to a series of surveys online pertaining to adolescents' mental health (Revised Child Anxiety and Depression Scale), family functioning (Self-Report of Family Inventory), and experiences of peer victimization (Peer Experiences Questionnaire-Revised). Results: There were statistically signiicant interactions between social-communication skills and the environment in both family (△R 2 = 0.02) and peer (△R 2 = 0.02) contexts. For youth with better social-communication skills, there was a positive association between peer victimization and depression symptoms and a negative association between family competence and depression symptoms. Conclusion: Findings support social-push interactive models in which better social-communication skills are associated with fewer depression symptoms in the context of less-stressful peer and family environments, highlight the utility of ecologically informed approaches to the mental health of youth with ASD, and suggest several areas for future study.Ecological and systems theories of development highlight the interaction between characteristics of an individual and their many contextual environments (Bronfenbrenner, 1986;Danforth, 2013 Danforth, , pp. 1046 Danforth, -1050. While these types of theories have been widely applied to understanding the mental health of neurotypical populations, research on the mental health of adolescents with autism spectrum disorder (ASD) -a heterogeneous neurodevelopmental disorder characterized by impairments in social communication, and persistent patterns of restricted, repetitive behaviors that appear early and continue across the lifespan (APA, 2013) -has only recently begun to adopt ecological approaches (e.g., Derguy et al., 2016). Comorbid mental and physical health conditions, including attention-deicit/hyperactivity disorder, anxiety and mood problems, epilepsy, gastrointestinal symptoms, challenging behavior, and sleep problems, are common in individuals with ASD (Matson & Goldin, 2013). Certain individual characteristics, including