Purpose: The purpose of this study was to validate the Korean version of the Ethical Leadership at Work questionnaire (K-ELW) that measuresRNs’ perceived ethical leadership of their nurse managers. Methods: The strong validation process suggested by Benson (1998), includingtranslation and cultural adaptation stage, structural stage, and external stage, was used. Participants were 241 RNs who reportedtheir perceived ethical leadership using both the pre-version of K-ELW and a previously known Ethical Leadership Scale, and interactionaljustice of their managers, as well as their own demographics, organizational commitment and organizational citizenship behavior. Dataanalyses included descriptive statistics, Pearson correlation coefficients, reliability coefficients, exploratory factor analysis, and confirmatoryfactor analysis. SPSS 19.0 and Amos 18.0 versions were used. Results: A modified K-ELW was developed from construct validity evidenceand included 31 items in 7 domains: People orientation, task responsibility fairness, relationship fairness, power sharing, concern forsustainability, ethical guidance, and integrity. Convergent validity, discriminant validity, and concurrent validity were supported according tothe correlation coefficients of the 7 domains with other measures. Conclusion: The results of this study provide preliminary evidence thatthe modified K-ELW can be adopted in Korean nursing organizations, and reliable and valid ethical leadership scores can be expected.