This study explored whether gender differences exist in social support, optimism/pessimism, and psychological well-being among university student athletes and examined the relationship among these three variables and the mediating effect of optimism/pessimism. A total of 322 university student athletes (159 men and 163 women) who were Division 1 athletes participated in this study. The research instruments used in this study comprised the revised Athletes’ Received Support Questionnaire, the Life Orientation Test, and the Psychological Well-Being Scale. The results demonstrated the influence of gender differences for some variables. Regarding pessimistic tendency and autonomy (a dimension of the Psychological Well-Being Scale), the average scores of men were significantly higher than those of women. Regarding the other three dimensions of the Psychological Well-Being Scale (purpose in life, positive relationships with others, and personal growth), the average scores were higher for women than for men. Moreover, significant positive correlations were observed among social support provided by coaches, optimism, and psychological well-being. Optimism mediated the relationship between social support and psychological well-being, and pessimism was negatively correlated with psychological well-being; however, the mediating path was not significant. Finally, suggestions for future research and practical implications are proposed for researchers, educators, and supervisors in the field of sports.
