Mediating Effects of Emotional Regulation on the Relationship between Stress and Burn-out among College Athletes. KINESIOLOGY, 2016, 18(3): 23-33. [PURPOSE] The purpose of this study was to identify the mediating effects of emotional regulation factors on the relationship between stress and burn-out among college athletes. [METHODS] Four hundred fifty basketball, baseball and soccer athletes registered to the Korean Sport Olympic Committee completed the questionnaires, and 419 responses were used for the analyses after the initial screening process. Using the SPSS Ver.20.0, frequency analyses, exploratory factor analyses, validity analyses, correlation analyses, multiple regression analyses, and hierarchical regression analyses were performed. [RESULTS] Results showed, first, competition stress and athletic support factors positively influenced the emotional drain factor of the burn-out. Also, the impersonalization factor was positively influenced by competition, athletic performance, and athletic support while the personal achievement factor was positively influenced by competition and athletic performance. Next, these relationships between stress and burn-out of the college athletes were reported to be mediated by emotional regulation. Specifically, the regulating effect was displayed when competition, social environment and athletic support factors of stress were interacting with the cognitive reappraisal factor of the emotional regulation. [CONCLUSIONS] These results emphasize the importance of emotional regulation ability when college athletes are in the conditions with high levels of stress and burn-out.