Aims: Job satisfaction is one of the important factors of job success and improves people's performance. Thus, the present study was conducted to investigate and prioritize the factors affecting job satisfaction among employees of hospitals affiliated to NAJA in Tehran, Iran.

Materials & Methods: This was a descriptive-correlational study. The statistical population of this study was all employees of hospitals affiliated to NAJA in Tehran, Iran in 2019. According to the volume of the mentioned population, a statistical sample of 640 people (340 men and 300 women) from the employees working in these hospitals was selected based on the Random Stratified Sampling technique and the number of people in each stratum. This study’s instrument was the Job Satisfaction Index (JDI) which was filled by the sampled individuals.

Findings: The results of data analysis showed that age and job history had positive and significant relationships with job satisfaction (P<0.05), but there was no relationship between education and job satisfaction (p<0.05). The independent T-test was used to examine the relationship of gender, marital status, and type of employment with job satisfaction. The mean job satisfaction score of women was higher compared to men. There was no significant difference in job satisfaction between single and married participants. Moreover, people with a formal contract had higher job satisfaction. In order to determine the order of priority in employee job satisfaction, the Friedman test was used, which showed the first to fifth priorities influencing job satisfaction to be the variables of colleague, job, supervisor, payment, and promotion with average ranks of 4.28, 4.4, 3.62, 1.57 and 1.53, respectively.

Conclusion: In general, the study results showed that age, gender, job history and type of contract are the components associated with the job satisfaction of employees of hospitals affiliated with NAJA in Tehran. Additionally, among the sub-components related to job satisfaction, the role of the colleague, supervisor, and the job itself is more prominent.