This study aimed to identify the relationship between internal marketing and internal service quality, also this study came to identify the mediating role of organizational commitment in the relationship between internal marketing and internal service quality. Sample of the study consisted of (202) workers in the five star hotels in Amman. The results showed that There was a statistically significant impact for the internal marketing on the reliability of five star hotels in Amman. These results indicate that there was an impact for internal marketing on reliability. And also there was a statistically significant impact for the internal marketing on the responsiveness of five star hotels in Amman.