Background: Authentic leadership has the power to affect nurses' behavior and job outcomes. As leaders, head nurses can utilize authentic leadership style to favorably influence nurses, increasing their creativity. Aim: the study aimed to assess the effect of training program regarding authentic leadership style for head nurses on creativity of nurses. Design: A quasi-experimental research design was utilized in this study. Setting: The study was conducted at Zagazig University Hospitals, which include two sectors the Emergency sector and El-Salam sector Subjects: Two types of samples All head nurses (n=110) who working in the above mention setting and was divided randomly into equal groups (experimental and control), and stratified random sample from nurses (n=375) was included. Data collection tools: Four tools were used for data collection (1) Knowledge questionnaire test, which included head nurses'demographic data, and head nurses' knowledge test regarding authentic leadership (2) Authentic leadership attitude questionnaire. (3) Observational check list (4) Creativity test consists of two parts: Personal data of nurses and creativity test Results: There was a statistically significant difference in total knowledge, attitude and skills pre, post and follow up applying authentic leadership training program. Conclusion: The training program for head nurses was effective and improved their level of knowledge, attitude and skills also there was statistically significant correlation between nurses' creativity throughout program phases. Recommendation: An authentic leadership educational program is recommended to be recognized and implemented for all head nurses who in a management position in the nursing field in other hospitals Hospital and Nursing administrators should do their best for keeping and enhancing nurses' creativity