Success in an organization is the result of applying professional ethics that constitutes legitimate norms or standards that govern professional behavior. Professional ethics is an important part of nursing practice and it provides the standards of professional behavior for nurses. Indeed, nurses have an ethical obligation to contribute to a culture of civility and respect in the work setting. Purpose: The aim of this study was to examine the effectiveness of education program regarding professional nursing ethics on workplace civility. Methods: Quasi experimental design was utilized. Study Setting: the study was conducted in critical care units at Benha University Hospital. The study sample was: All the available staff nurses (176) working in the above mentioned setting. Tools of data collection: Three tools were used: (1) Professional nursing ethics knowledge questionnaire, (2) Observational checklist for professional nursing ethics, and (3) Clark Workplace Civility Index (WCI). Results: There was a highly statistical significant improvement in staff nurses' knowledge and practice regarding professional nursing ethics after implementation of program. There was a highly statistical significant improvement in staff nurses' level of workplace civility after implementation of program. Conclusion: The study concluded that there was highly statistically significant correlation between professional nursing ethics practice and workplace civility among staff nurses immediate post program (P