Background and purpose: Organizational commitment is one the important attitude in organizations, which together with development of ethical values that needs to be emphasized. The goal of this study is to survey relationship between staff ethical values and organizational commitment in public and non- public hospitals in Tehran. Materials & Methods: This correlation study includes 280 public and non-public hospital workers randomly selected. The data were gathered using a standard questionnaire and analyzed by descriptive statistical and Pearson correlation and multiple regression analysis through SPSS software. Results: The organizational commitment mean was 6.17±.632 and ethical values mean was 5.64±.843. The study shows high correlation between organizational commitment and ethical values. Conclusion: Policymakers and hospital managers need to plan and improve cultural and ethical issues which can increase the organizational commitment.