Purpose: This study was conducted to investigate the relationships among trait anger, anger expression, positive thinking, and gratitude in college students. Methods: The participants were 370 college students recruited from two universities in P and D cities. Data were analyzed using descriptive analysis, t-test, ANOVA, Pearson correlation coefficients, and hierarchical regression analysis with the SPSS/WIN 20.0 program. Results: There were significant differences in trait anger and anger-in according to religion and college majors. Moreover, anger-control differed according to college majors. There were significant correlations among trait anger, anger expression, positive thinking, and gratitude. Positive thinking was a significant factor of trait anger explaining 17.0% of the variances. Positive thinking and gratitude were significant factors of anger-control explaining 12.0% of the variances. Conclusion: The results of this study suggest that there is a need for strategies to decrease trait anger and promote anger-control by enhancing positive thinking and gratitude in college students.