Background: Nurse managers leadership style is especially important to enhance staff
nurses commitment which fulfill helping organizational objectives. Aim: the aim of this study
was to identify the effect of nurse managers' leadership styles on staff nurses' organizational
commitment through: assessing different styles of leadership among nurse managers, determining
level of organizational commitment among staff nurses and finding out the effect of nurse
managers' leadership styles on staff nurses' organizational commitment.Study setting: this study
was carried out at Nasser Institute Hospital. Study design: this descriptive correlational design.
Study subjects: the study was carried out on 80 nurse managers, and 174 of their staff nurses in
the hospital setting. Tools of data collection: Two tools were used to collect data namely,
leadership style questionnaire and organizational commitment questionnaire. Results: the
democratic leadership style was the most highly used by (63.8%) of nurse managers and (54.6%)
of staff nurses had high total commitment level. Conclusion: The study concluded that the nurse
managers' democratic leadership score is a positive predictor of staff nurses' commitment, while
the autocratic style score is a negative predictor. Furthermore, the study recommends thatfrequent regular meetings between nurse managers and their staff nurses to discuss nurses work
problems and recovered their problems for better relationships and enhances support at work with
suitable rewards for staff nurses.