In order to determine the relationship between self-confidence and sport commitment with the sport identity of the gymnasts of the premier league and the Iranian national team, a correlation study was done in which 120 gymnasts of the teams of premier league and members of the national team were selected randomly. The measurement tools were the standard questionnaires of sport self-confidence of Vealey (1986), sport commitment of Scanlan (1993), and sport identity of Cieslak (2004). In order to determine the face and content validity (experts’ ideas), structure validity (factor and confirmatory analysis) and the reliability of the questionnaires, Cronbach's Alpha (á = 0.825, 0.872, 0.821) was calculated. A group of exerts approved the face and content validity of the questionnaires. In order to analyze the data, descriptive and illative statistical methods (multiple regression correlation test, multivariable regression) were used. Findings showed that there is a positive significant relationship between self-confidence and sport identity (r = 0.665) and between sport commitment and sport identity (r = 0.628). Results of the regression, further, showed that self-confidence (r = 0.671) and sport commitment (r = 0.562) were the predictors of sport identity.
