Background:Nursing professionals play a crucial role in the global health care system and the worldwide health care system depends heavily on nurses due to the rising acuity of patients and the continued nursing shortage, so the newly graduated nurses should pick up nursing management and leadership skills to collaborate with other healthcare professionals. Aim: The study aimed to explore the effect of leadership and managerial skills program on newly graduates nurses' competencies. Design: A quasi experimental design was utilized in this study. Setting: The study was conducted at the hospitals of EL- Qalioubia Branch of Health Insurance which include three hospitals (EL-Nile, Benha and Bahteem hospital). Subjects: A convenient sample of (60) newly graduates nurses were included. Data collection Tools: Three tools were used for data collection, (1): Newly Graduates Nurses' knowledge questionnaire regarding leadership and managerial skills, (2): Newly Graduates Nurses' leadership and Managerial skills and (3): Structured questionnaire about newly graduates nurses’ attitude toward managerial competencies. Results:There was a satisfactory level of newly graduates nurses’ knowledge, a competent level of newly graduates nurses’ skills and a positive level of newly graduates nurses’ attitude during post and three months follow up compared with pre phase regarding leadership and management skills among the studied newly graduates nurses. Conclusion: There was a highly statistically significant difference between total mean score of knowledge, skills and attitudes during pre, post and three months follow up before and after the implementation of the leadership and managerial skills program among the studied newly graduated nurses. Recommendation: Create and design a job description which involves leader and manager roles for the newly graduate nurses should be provided and explained to them during the orientation program.