The purpose of this study was to identify the concept of oppressed group behavior shown among nurses, and thus, to give an operational definition. Methods : The concept analysis method, which comprises of eight stages, developed by Walker and Avant was used. Results : The defining attributes of nurses` oppressed group behavior identified in this study were 1) gregariousness and conformity, 2) self-depreciation, and 3) submissive aggressiveness including horizontal violence. The antecedents to nurses` oppressed group behavior were 1) identification with the oppressor, 2) marginalization, and 3) low self-esteem. The consequences of nurses` oppressed group behavior included 1) lack of empowerment, 2) burnout, and 3) intension of turnover. Conclusion : Considering the results, with continuous examination, nurses` oppressed group behavior should not be tolerated so that nurses are able to improve their job satisfaction and quality of nursing care.