en General پژوهشي Research Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Times New Roman;"><strong>Background:</strong>Body image, perfectionism, and mental toughness can significantly influence self-acceptance in adolescent girls, affecting their psychological well-being.<br> <strong>Objectives:</strong>This study investigated how body image and perfectionism influence self-acceptance in adolescent girls, with mental toughness as a mediating factor.<br> <strong>Methods:</strong>This correlational study included 400 female high school students from Kahnuj during the 2023 - 2024 academic year. Data were collected using Cash&#39;s (2015) Body Image Questionnaire, Clough et al.&#39;s (2012) Mental Toughness Questionnaire, Chamberlain and Haaga&#39;s (2021) Unconditional Self-acceptance Questionnaire, and Short et al.&#39;s (2010) Perfectionism Questionnaire. Analysis employed Pearson correlation, multiple regression, and the Sobel test using SPSS 25 and Amos 24.<br> <strong>Results:</strong>Mental toughness significantly mediated the relationships between self-acceptance and body image [variance accounted for (VAF) = 0.321] and positive perfectionism (VAF = 0.263), but not negative perfectionism (VAF = 0.126). In addition, significant direct effects were observed between body image and mental toughness (&beta; = 0.26, P = 0.001), positive perfectionism and mental toughness (&beta; = 0.23, P = 0.007), negative perfectionism and mental toughness (&beta; = -0.24, P = 0.004), body image and self-acceptance (&beta; = 0.17, P = 0.001), positive perfectionism and self-acceptance (&beta; = 0.20, P = 0.001), negative perfectionism and self-acceptance (&beta; = -0.52, P = 0.001), and mental toughness and self-acceptance (&beta; = 0.31, P = 0.001). Model fit showed acceptable values: Chi-square/degrees of freedom = 4.26, Goodness-of-Fit Index = 0.90, Incremental Fit Index = 0.926, Comparative Fit Index = 0.926, root mean square error of approximation = 0.078.<br> <strong>Conclusions:</strong>Positive body image and adaptive perfectionism enhance mental toughness, thereby fostering self-acceptance, whereas maladaptive perfectionism directly reduces self-acceptance. Interventions should target these factors to promote psychological well-being in adolescent girls.</span></span></div> Self-acceptance,Body Image,Perfectionism,Mental Toughness,Girl,Teenager 0 0 http://mcj.bums.ac.ir/browse.php?a_code=A-10-1-304&slc_lang=en&sid=1 Eshagh Raisi Ahvan 10031947532846004911 0009-0009-0354-3928 No Department of Psychology, BA.C., Islamic Azad University, Bandar Abbas, Iran Kobra Haji Alizadeh hajializadehk@iau.ac.ir 10031947532846004912 10031947532846004912 Yes Department of Psychology, BA.C., Islamic Azad University, Bandar Abbas, Iran Eghbal Zarei 10031947532846004913 10031947532846004913 No Professor, Department of Psychology and Counseling, University of Hormozgan, Bandar Abbas, Iran