Purpose: The purpose of this study was to identify the relationship between critical thinking disposition and clinical competency of nursing students. Method : The sample consisted of 151 nursing students, who have ever had clinical practice. Data were collected by self reporting questionnaire for 13 days from April 18-30, 2005. The data were analyzed by descriptive statistics, t-test, ANOVA, Duncan test, Pearson Correlation Coefficient with SPSS Programs. Result : The result of this study were as follows : 1. The total mean score of critical thinking dispositions in the nursing students was moderately(3.50). There was a statistically significant difference in critical thinking disposition according to satisfaction with the nursing major(F=5.563, p=.005). 2. The total mean score of clinical competency in the nursing students was slightly high(3.37). There was a statistically significant difference in clinical competency according to adaptation with the nursing major(F=5.202, p=.007), satisfaction with clinical practice(F=3.172, p=.045). 3. A significant positive correlation between critical thinking disposition and clinical competency was founded(r= .421, p<.000). Conclusion : In conclusion, this study revealed that critical thinking disposition influences clinical competence. Therefore, the finding of this study may provide significant basic data for nursing education and nursing practice.