This study investigated the contribution of the reflected appraisal process to the ontogeny of children's self-perceptions of physical competence. Emanating from symbolic interactionist thought, reflected appraisals refer to individuals' perceptions of others' evaluations of their abilities. The influence of parents' appraisals of their child's competence on the child's self-appraisals was hypothesized to be mediated by parents' reflected appraisals. Data were collected from a sample of 147 sixth graders and their parents in three waves over one school year. Structural equation modeling revealed that (1) parents' appraisals at Wave 1 influenced children's reflected appraisals of parents at Wave 2; (2) reflected appraisals at Wave 2 influenced children's self-appraisals at Wave 3, controlling for both the child's actual level in sport (as assessed by the child's grade in physical education) and the child's self-appraisals at Wave 1; and (3) the influence of parents' appraisals on their child's self-appraisals was nonsignificant when reflected appraisals were controlled for. This study supported the mediational role of the reflected appraisal process. The findings from this study provide a unique contribution to the sport socialization knowledge base by highlighting the role of the reflected appraisal process in the formation of children's self-appraisals of ability.