Background: Self-concept is one of the most important health-related psychological constructs. Low self-concept has a direct impact on the social and psychological adjustment of the adolescents. Aim of the study was to evaluate the effectiveness of social problem solving training program on enhancing self-concept of adolescents in Zagazig city. Subjects & Methods: Research design: A quasi-experimental pretest-and-posttest design was utilized in this study. Setting: The study was conducted in two secondary schools in Zagazig city. Subjects: A sample of 45 adolescents had low self-concept selected by using a random multi-stage cluster sampling technique.. Tools of data collection were; socio-demographic data, Teneesee Self-concept Scale (TSCS), and Social Problem Solving Inventory-Revised (SPSI-R). Results: The study results revealed post-intervention statistically significant differences in adolescents' total social problem solving, negative problem orientation and avoidance problem solving, indicating improvement. Also, there was a statistically significant improvement in moral self-concept after the intervention. Conclusion: The training program is effective in ameliorating adolescents' social problem solving ability which in turn was a positive predictor of their self-concept. Recommendations: It is recommended to implement the developed program on a wider scale in the study settings and in similar ones for more generalization and further studies are needed to assess the effect of various factors on self-concept to assist in building more effective and more tailored interventions for adolescents.