PURPOSE: The purpose of this study was to investigate RN-BSN students' clinical nursing competency in order to establish baseline data for developing nursing competency based clinical education for RN-BSN students. METHOD: A survey of 1,453 RN-BSN students from 21 nursing schools was conducted using a self administered questionnaire. RESULT: The mean score of the clinical nursing competency was 2.93. The scores for competency were shown as 2.91 for nursing management, 2.94 for developing professionalism & legal implementation, 2.95 for critical thinking, 2.96 for teaching & leadership, and data collection, basic nursing care, and communication were above 3.00. The items perceived as insufficient competency were physical examination and observation & monitoring in data collection, cardiopulmonary resuscitation, psycho-social care, spiritual care, hospice in basic nursing care, application of knowledge and theory, formulating nursing diagnosis, nursing care planning in critical thinking, education material development, leadership, delegation in teaching and leadership, analysis of organization, planning, infection control, role & job description, evaluation of nursing activities in nursing management, quality improvement, and research in developing professionalism and legal implementation. CONCLUSION: This study will contribute to developing a nursing competency based on clinical education for RN-BSN students who have various education needs and clinical backgrounds.