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Background: Autistic adults have an increased risk of poor mental health. Although parental care and overprotection in childhood influence later attachment and mental health in the general adult population, this has not been investigated in the autistic population. Likewise, the roles of psychological inflexibility and social engagement in influencing mental health outcomes for autistic adults have yet to be examined., Aims: To examine if retrospectively recalled childhood experiences of parental care and overprotection, as well as current adult attachment, psychological inflexibility and social engagement are associated with mental health in autistic adulthood. Further, to examine mediators of the association between parental care and overprotection and mental health in autistic adults., Methods and Procedures: A community-recruited convenience sample of 126 Australian autistic adults completed an online survey assessing childhood experiences of parental care and overprotection and current adult attachment, psychological inflexibility, social engagement, and mental health., Outcomes and Results: Linear regressions showed that psychological inflexibility was the strongest predictor of depression, anxiety, and stress, followed by attachment anxiety (depression, anxiety) and attachment avoidance (anxiety, stress). Mediation analyses revealed that psychological inflexibility and attachment anxiety mediated the associations between parental care and overprotection and mental health outcomes in autistic adulthood., Conclusions and Implications: Psychological inflexibility and adult attachment (anxious and avoidant attachment) are important to understanding mental health of autistic adults. Psychological inflexibility and attachment anxiety mediate associations between recalled childhood experiences of parental care and overprotection and mental health in autistic adulthood., Competing Interests: Declaration of Competing Interest The Parenting and Family Support Centre is partly funded by royalties stemming from published resources of the Triple P – Positive Parenting Program, which is developed and owned by The University of Queensland (UQ). Royalties are also distributed to the Faculty of Health and Behavioural Sciences at UQ and contributory authors of published Triple P resources. Triple P International (TPI) Pty Ltd is a private company licensed by Uniquest Pty Ltd on behalf of UQ, to publish and disseminate Triple P worldwide. The authors of this report have no share or ownership of TPI. TPI had no involvement in the study design, collection, analysis or interpretation of data, or writing of this report. Dr Whittingham is an employee at UQ. Dr Mitchell was an employee at UQ at the time this research was conducted, and holds an honorary appointment at UQ., (Copyright © 2022 Elsevier Ltd. All rights reserved.)