حسین حمزوی

Creativity and innovation are considered as a way for organizations to continue to survive and compete in the global arena. An organization must be supported by efficient and effective employees to achieve its set goals, and this requires employees to be creative so that the organization has a competitive advantage over other organizations. Encouraging and strengthening creativity among employees is an important strategy for maintaining and improving competitive advantages, ensuring long-term survival and growth of organizations. On the other hand, it is important to determine which leadership styles are related to employees' creativity through which methods, procedures and approaches and through which strategies. Organizational citizenship behavior as a psychological behavior may play a critical role as a mediator in our relationship between leadership styles and employee creativity. Therefore, the purpose of this research is to investigate the effect of servant leadership and ethical leadership styles on employee creativity with the mediating role of organizational citizenship behavior. The current research is an applied research in terms of its purpose, and a descriptive-survey research in terms of collecting data and information. The statistical population of this research is all the employees of the Persian Gulf State University of Bushehr, numbering ۳۰۲ people, and the sample size based on Cochran's formula is ۱۶۹ employees. The tool for collecting data and information from the statistical population was a questionnaire. Questionnaire criteria to measure servant leadership variable from Peterson (۲۰۰۳) with four dimensions (serving, humility, trust and kindness), ethical leadership from Brown et al. (۲۰۰۵) with two dimensions (ethical person and ethical manager), citizenship behavior organization from Lee and Allen (۲۰۰۲) with two dimensions (organizational citizenship behavior directed at colleagues and organizational citizenship behavior directed at the organization) and a one-dimensional employee creativity questionnaire from Lee et al. (۲۰۱۴) It was used completely against me. In order to analyze the research data, the Structural Equation Model (SEM) method and    ۲۲ and Lisrel software were used. The research results showed that: ۱) servant leadership styles and ethical leadership have a significant effect on organizational citizenship behavior, ۲) servant leadership styles and ethical leadership have a significant effect on employee creativity, ۳) organizational citizenship behavior has a significant effect on employee creativity, ۴) Servant leadership and ethical leadership styles have a significant effect on employees' creativity with the mediating role of organizational citizenship behavior.