Based on the social cognitive learning theory (1997), peer learning can be viewed as an effective way of enhancing learning. In this study, peer tutoring, a form of peer learning, was examined. The current study investigated the influence of a peer tutoring program implemented at Sultan Qaboos University on students' English self-concept. 125 Omani university students participated in the study. The Students English Self-Concept Scale (SESCS) and the Tutorial Programs Factors Scale (TPFS) were utilized to collect the data. The findings demonstrated that peer tutoring has a positive influence on English self-concept. Three tutorial program factors were found to positively predict English self-concept. Implications for EFL teachers, and recommendations for future research were discussed.