The purpose of this study was to assess the ethical leadership of nurse managers and to identify their effects on the perceived ethical confidence of nurses. Participants were 219 nurses drawn from three general hospitals in South Korea. The data were analyzed using a descriptive analysis, t-test, ANOVA, Pearson correlation coefficient, and a stepwise multiple regression. The mean scores of seven ethical leadership factors are as follows: people orientation (3.23±0.69), task responsibility fairness (3.53±0.79), relationship fairness (3.93±0.86), power sharing (3.21±0.54), concern for sustainability (3.50±0.62), ethical guidance (3.35±0.63), and integrity (3.50±0.66). The mean score of perceived ethical confidence is 3.31± 0.52. The factors found to influence perceived ethical confidence are ethical guidance (b=.38), clinical career (b=.34), ethics education experiences (b=.17), with an explanatory power of 27.2%. The results of this study indicate that the ethical leadership of nurse managers affects the perceived ethical confidence of nurses. Thus, improving nurse managers’ ethical leadership and ethics education for nurses would likely increase their perceived ethical confidence.