Background: Green behaviors are frequently characterized as employee acts that promote environmental management initiatives. Nurses' behavior is significantly influenced by the ethical work environment and moral distress. Regardless of the context, nurses should be capable of providing morally sound and clinically excellent care in the absence of moral discomfort. Aim: to explore the impact of ethical climate on moral distress and nurses' green behavior. Subjects: A convenient sample of 200 nurses working in Sohag University Hospital, Egypt. Design: This study used descriptive correlational design. Tools: three tools were used to collect the data; Tool I: Hospital ethical climate scale, Tool II: moral distress scale, Tool III: Employee green behavior. Results:  It was revealed that 90% of nurses had positive perceptions of the ethical work climate. Likewise, 88% of nurses had high levels of moral distress, and 47.7% of them had moderate levels of organizational citizenship behavior. Conclusion: Employee green behavior was strongly and positively connected with the ethical climate and negatively correlated to moral distress. Recommendation: Establishing a suitable professional performance environment and preserving moral relationships with nurses that support them in performing better will improve the ethical climate in hospitals for nurses.