Limited data exists on the role of attachment in influencing the development and wellbeing of refugee children. Herein we describe patterning and correlates of attachment in an Australian sample of adolescent Tamil refugees. Sixty-eight adolescents, aged 10–18, were assessed for trauma exposure, mental health problems and pattern of attachment. Attachment representations were assessed by discourse analysis of structured attachment interviews. Mothers of the adolescents were assessed for post-migration family stressors, depression, and post-traumatic stress disorder (PTSD) using self-report measures. Inhbitory A and A+ patterns of attachment predominated. Attachment insecurity was associated with child trauma exposure (β = .417), post-migration family stressors (β = .297) and maternal PTSD (β = .409). Path modeling demonstrated that attachment insecurity mediated associations of child trauma exposure, family stressors and maternal PTSD with child mental health problems, the model yielding adequate fit (Comparative Fit Index [CFI] = .957; standardized root mean square residual [SRMR] = .066; R2 .449). Our cross-sectional findings suggest that compromised attachment security is one potential mechanism by which the adverse effects of refugee family trauma and adversity are transmitted to children. Resettlement policy and psychosocial services should aim to preserve and/or reestablish attachment security in child-caregiver relationships through policy that reduces family stressors and interventions that bolster parental mental health and caregiver sensitivity.