Background: the quality of relationship between supervisors and subordinates and leadership of head nurses played an important role in their subordinates such as organizational commitment, job performance and promotions. Aim: the aim of this study was to determine relation between leadership styles and behaviors of nurse managers' and organizational commitment of staff nurses. Design: Descriptive correlational research design was used to achieve the aim of the current study. Setting: the study was conducted in Health Insurance Hospital, Minia governorate at Minia city. Subjects: the subject of study was included all nurse managers (head nurses) and staff nurses in Health Insurance Hospital (n=255), divided as (17 nurse managers + 238 staff nurses). Tools: three tools were used to collect data pertinent to the study as: Leadership Styles Questionnaire (Multifactor Leadership Questionnaire 5X), Leadership Behavior, and the Organizational Commitment of the Staff Nurses Questionnaire. Results: The study revealed that highest percentage of head nurses had high level for transformational (63%) and transactional style (59.7%); also, more than half (58.8%) of head nurses had high level of leadership behaviors and more than one third (39.9%) had moderate level. Moreover, it was noted that more than half (57.1%) had high level commitment, and more than one third (41.2%) had moderate level. Conclusion: there were positive correlations between leadership style as well as leadership behaviors with the organizational commitment. Recommendations: Periodic training courses should be provided in order to keep head nurses updating knowledge, skills, and attitudes regarding to leadership skill, behaviors and styles.