KMAN Publication Inc. (KMANPUB) Psychology of Woman Journal 3041-8615 6 Serial Number 23 2025 07 01 Effectiveness of Acceptance and Commitment Therapy on Self-Care Behaviors and Internalized Shame in Women with Narcissistic Personality Disorder Effectiveness of Acceptance and Commitment Therapy on Self-Care Behaviors and Internalized Shame in Women with Narcissistic Personality Disorder 1 7 10.61838/kman.pwj.6.3.12 EN Journal Article 2025 02 27 <p><strong>Objective:</strong> The present study aimed to determine the effectiveness of Acceptance and Commitment Therapy (ACT) in improving self-care behaviors and reducing internalized shame in women with Narcissistic Personality Disorder (NPD).</p> <p><strong>Materials and Methods:</strong> This semi-experimental study was conducted using a pre-test–post-test design with a control group. The research population consisted of women diagnosed with Narcissistic Personality Disorder who referred to psychological service centers and clinics in Tehran during the spring of 2024. A total of 30 individuals were selected through purposive sampling and were randomly assigned to experimental and control groups. The experimental group received Acceptance and Commitment Therapy across ten 90-minute sessions, while the control group received no intervention. The research instruments included the Self-Care Behaviors Scale and the Internalized Shame Scale. Data were analyzed using Chi-square tests, multivariate analysis of covariance (MANCOVA), and Bonferroni post hoc tests.</p> <p><strong>Findings:</strong> The results indicated that the groups did not differ significantly in terms of gender, age, and education level (p &gt; .05). Moreover, compared to the control group, Acceptance and Commitment Therapy significantly improved self-care behaviors and reduced internalized shame (p &lt; .001).</p> <p><strong>Conclusion:</strong> Based on the findings, Acceptance and Commitment Therapy can be considered an effective method for improving self-care behaviors and reducing internalized shame in women with Narcissistic Personality Disorder.</p> https://journals.kmanpub.com/index.php/psywoman/article/download/4034/7531