Purpose: The purpose of this study was to discover the effect of emotional intelligence on organizational performance in clinical nurses regarding anger expression, job satisfaction, job commitment, and turnover intention. Methods: Data were collected by self-administered questionnaires from 162 clinical nurses in three university hospitals in 2008, and analyzed by the SPSS 14.0 Window program, using descriptive statistics, pearson correlation, and stepwise multiple regression. Results: Emotional intelligence showed a statistically significant association with each of anger expression-in, anger expression-control, job satisfaction, job commitment, turnover intention, and organizational performance. The multiple regression analysis also showed that organizational performance was statistically significant with job satisfaction, job commitment, and emotional intelligence respectively. 38.0% of the variation of organizational performance was explained by these variables. Conclusion: Emotional intelligence significantly affected organizational performance together with job satisfaction and job commitment. From this result, it could be concluded that nursing interventions for emotional intelligence have a positive effect on improving organizational performance. Further studies are needed to develop nursing intervention programs for emotional intelligence and test its effects on organizational performance.