This study aims to identify the role of job satisfaction in improving the performance of employees. It also aims to reveal the relationship between job satisfaction and performance improvement. The study sample was the employees in the central hospital in Hafr Al-Batten, Saudi Arabia. The research problem was about the level of job satisfaction may decrease among some employees due to the policies and administrative methods used in their workplaces, which leads to a low level of performance and prevents the full achievement of the objectives of the institution. The researcher used the analytical descriptive approach to collect data, and the questionnaire was used as a study tool and designed according to the scientific steps then distributed to the study sample. The data was analysed by the Statistical Packages for the Study of Social Sciences (SPSS) program. Based on the data analysis, the most important results are that there is a strong direct correlation between job satisfaction and the performance of the employees at the central hospital in Hafr Al-Batten. The study recommends that more attention should be given to job satisfaction, for its positive relationship in improving performance levels of the employees, in addition to that it represents one of the demands of modern management through which it seeks to enhance the capabilities of employee performance and loyalty. And also the development of incentives and rewards systems in the hospital under investigation for a higher level of satisfaction and for more efficiency and effectiveness in performance. The researcher suggests conducting studies on the dissatisfaction of some workers to find out the real causes and treat them.