Background: Key strategy for the success of health organizations resides in the capacity of the nurse manager to develop advanced competencies in management, and advocate for nurses to serves as the bedrock for supporting problems affecting nursing practice, the nursing profession as a whole, and health care issues, nurse managers are expected to influence the workplace environment and build flourishing teams positively. Aim: to assess managerial competencies as perceived by nursing staff' and its relation to their advocacy and flourishing at work.
Research design: A descriptive correlation research design was utilized in this study. Setting: The study was conducted at Minia University Kidney and Urology Hospital. Subjects: All staff nurses available which constitute (N=231), who worked at Minia University Kidney and Urology Hospital during the time of data collection. Tools: three tools as follows; tool (I), Nurse Manager Competence Scale; the first part was personal data, and the second part was the Nurse Manager Competence Scale. Tool (II), Employee Advocacy scale. Tool (III), Flourishing Scale. Results: more than half (52.8 %) of the nurses' perception of total nurse manager competence was high, slightly more than half of them (51.5 %) had a high perception about total employee advocacy, while more than three-thirds (70.5 %) of them highly perceived flourishing at work. Conclusion: There was a strong positive correlation between perceived managerial competencies, nursing staff' advocacy, and their flourishing at work Recommendations:  Developing training programs to increase knowledge related to diverse managerial competencies, creating a supportive environment, advocating for better work conditions, and building a culture of inclusion, thus, promoting staff nurses' flourishing at work.