Purpose: We tested the moderating role of physical self-perceptions in the relationship between physical maturity and physical self-worth (PSW). Method: Students in Grades 5 through 8 (N = 241; 57% females; M[subscript age] =12.30 years) completed a questionnaire assessing physical self-perceptions (i.e., perceived sport competence, conditioning, strength, and body attractiveness), PSW, and maturity status. Hierarchical multiple regression was used to test interactions between maturity and physical self-perceptions predicting PSW separately for boys and girls. Results: For girls, maturity level and physical self-perceptions explained significant variance, F(5, 131) = 73.44, p <0.001, R[superscript 2] = 0.74, with interactions explaining a little extra variance, ?F =3.42, p = 0.01, ?R[superscript 2] = 0.03. Perceived attractiveness interacted with maturity status to predict PSW (p =0.01), indicating that maturity was positively related to PSW only for girls with higher body attractiveness. Maturity status and physical self-perceptions also significantly predicted PSW in boys, F(5, 98) = 46.52, p <0.001, R[superscript 2] = 0.70, with interactions explaining a little extra variance, ?F = 3.16, p = 0.02, ?R[superscript 2] = 0.04. A statistically significant interaction between perceived strength and maturity (p <0.001) indicated that maturity related positively to PSW, but only for boys with higher perceived strength. Conclusions: The maturity-PSW relationship differs by gender and depends partly on physical self-perceptions. This finding reinforces previous findings that illustrate the relative importance of perceived attractiveness and strength for girls and boys, respectively. PSW is an important predictor of physical activity behavior; therefore, it is critical to understand the interplay between these key antecedents.