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en Effect of Emotion-Focused Therapy on Aggression and Distress Tolerance in Students with Clinical Aggression Symptoms Aims: Aggression in early adolescence is a critical psychological challenge that often arises from deficits in emotional processing and low distress tolerance. This study aimed to evaluate the efficacy of emotion-focused therapy on aggression and distress tolerance among middle school female students exhibiting clinical symptoms of aggression. Materials & Methods: This randomized clinical trial was conducted on 40 female middle school students in Tehran during the 2024-2025 academic year. Through multi-stage random sampling and clinical screening, eligible students were selected and randomly assigned to either the experimental group (n=20) or the control group (n=20). The experimental group received eight 90-minute sessions of emotion-focused therapy, while the control group remained on a waitlist. Data were collected using the Ahvaz Aggression Inventory and the Distress Tolerance Scale. Data analysis was conducted using SPSS 26. Findings: Emotion-focused therapy significantly improved aggression and distress tolerance in the experimental group compared to controls (p<0.001). Aggression decreased from 61.29±7.31 (pre-test) to 42.05±4.72 (follow-up) in the emotion-focused therapy group, whereas it remained stable in the control group (63.83±7.93). Distress tolerance increased from 27.85±8.02 (pre-test) to 50.09±5.39 (follow-up) in the emotion-focused therapy group, compared to stable scores in controls (25.74±8.94). These effects were sustained at the three-month follow-up, with significant group×time interactions observed for both outcomes. Conclusion: Emotion-focused therapy serves as an effective intervention for mitigating aggression and enhancing distress tolerance in adolescent girls.   Emotion-Focused Therapy,Aggression,Psychological Distress,Adolescent,Clinical Trial, 27 31 http://jccs.daneshafarand.org/browse.php?a_code=A-10-364-2&slc_lang=en&sid=8 R. Roustaei 1003194753284600387806 1003194753284600387806 No Department of Psychology, Ahv.C. (Ahvaz Campus), Islamic Azad University, Ahvaz, Iran S. Bavi 1003194753284600387820 1003194753284600387820 Yes Department of Psychology, Ahv.C. (Ahvaz Campus), Islamic Azad University, Ahvaz, Iran