The goal of this study was to investigate the relationship between the perceived frequency and perceived importance of social support with youth’s self-concept. Data from a large representative sample of 921 children and adolescents in grades 3 through 12 were analyzed. Results indicated that the relationships between the frequency of social support from parents, teachers, classmates, and close friends with self-concept were significant. However, only the perceived importance of social support from teachers was significantly related to self-concept. Finally, an interaction was found between the frequency of social support and the importance of social support from classmates and close friends on self-concept. These results suggest that self-evaluations of the importance of teacher support may be especially influential for youths’ self-concept, and that the ability to discount the value of support from classmates and friends, when it is lacking, may be protective to the self-concept of children and adolescents.