Adolescence is a critical and sensitive period of growth, marked by significant physical and psychological changes. During this time, adolescents often experience increased anxiety and concerns about their body image. Thisstudy aims to examine body image concern and demographic characteristics as predictors of anxiety in adolescent girls. This cross-sectional study included 381 female students aged 12-13 from Babol city. The participants were selected based on predefined inclusion criteria. Multi-stage sampling method was employed, and the samples were selected from six middle schools. The data collection tools consisted of a demographic information questionnaire, Littleton's body image concern scale, and Zung's anxiety scale. The mean score for body image concern was 16.59±44.82, while the mean score for anxiety was 10.53±37.31. When investigating the relationship between body image concern and anxiety, a significant and positive correlation between these two variables was observed during regression analysis (p<0.001). Both univariate and multivariate regression analyses indicated that for every one-unit increase in students' body image concern score, theiroverall anxiety score increased by an average of 0.34 units in both models (B: 0.34, 95 % CI: 0.29-0.39) (p<0.001). Additionally, in univariate regression analyses students whoreceived puberty information from sources other thantheir mother exhibited 2.68 units higher anxiety levels, which was statistically significant (B: 2.68, 95 % CI: 0.38-4.98) (p<0.001) and, concerning the preferred source of information, students who favored a non-mother source experienced 3.91 units increase in their anxiety score (B:3.91, 95 % CI: 1.74-6.08) (p<0.001). The results of multivariate regression analysis showed that with the presence of all independent variables in the model, 30 % of the dependent variable changes can be predicted (explained) (R 2 =0.302). The findings indicated a positive association between body image concerns and anxiety among students. Moreover, students who relied on sources other than their mother for obtaining information about puberty displayed higher levels of anxiety. Consequently, it is imperative to implement preventive and supportive programs targeting adolescents as well as empowering mothers to effectively deal with these issues.