This study aimed to understand the predictive role of mindfulness and cognitive emotion regulation in perfectionism among adolescent girls. The present study employed a descriptive-correlational research design. The statistical population comprised all female adolescents in Zahedan in 2024. As the study sample, 159 individuals were selected by a two-stage cluster design. The research tools were the Perfectionism Inventory (PI), the Five Facet Mindfulness Questionnaire (FFMQ), and the Cognitive Emotion Regulation Questionnaire (CERQ). Data were analyzed using SPSS version 27. The results showed that there was a significant correlation between aware actions (r = 0.227, p = 0.004), non-judgmental inner experience (r = 0.174, p = 0.029), and maladaptive cognitive emotion regulation strategies (r = 0.335, p < 0.001) with perfectionism. Moreover, maladaptive strategies predicted 11.2% of the variance of perfectionism. Overall, the findings indicated that none of the mindfulness facets significantly predicted perfectionism. In contrast, the use of maladaptive cognitive emotion regulation strategies was significantly associated with perfectionism and served as an effective predictor of it. Therefore, based on the findings, in designing educational and therapeutic programs for adolescents with perfectionistic tendencies, it is important to consider the theoretical foundation of the approaches, whether they are based on mindfulness or on cognitive emotion regulation.
