Abstarct: The present study examines the behavioral patterns of employee job loyalty using the Gray Rough Set Theory approach. In the present era, human resources are recognized as one of the most important resources of organizations, and job loyalty is considered a key factor in increasing productivity and reducing employee turnover rates. This study identifies factors affecting job loyalty and its relationship with the desire to quit, and uses the Rough Set Theory to extract behavioral patterns and analyze data. In this regard, the necessary data were collected from hospital employees in Semnan province and analyzed using Rosetta software. The results of this study show that factors such as job satisfaction, organizational communication, and attention to employee needs significantly affect job loyalty. Also, this study identifies dimensions of job loyalty, including organizational loyalty, cooperative loyalty, and tangible loyalty. The results of this study can help managers and human resources officials make strategic decisions to improve job loyalty and reduce turnover rates, and lead to creating a positive and sustainable work environment.