Adverse childhood experiences (ACEs) are early life events associated with negative physical, psychological, and social outcomes. In subsequent generation parent-child interactions, these outcomes are associated with adverse parenting practices. Parent-Child Interaction Therapy (PCIT) is an established intervention to mitigate potentially harmful outcomes of adverse parenting. However, poor parental engagement in PCIT can devalue the benefits of the intervention. The proposed study seeks to investigate the predictive role of mothers’ history of ACEs in four PCIT engagement outcomes: treatment completion, attendance rate, homework completion rate, and attitude towards therapy. Descriptive analyses, Student’s t-tests, and linear and logistic regression analyses will be conducted. Implications and future directions to address engagement in PCIT will be discussed