The success of service organizations in line with market-oriented activities requires that employee commitment be guaranteed, and one way to achieve such commitment is to implement internal marketing programs. Given the importance of internal marketing and market orientation, the present study attempts to examine the relationship between the two variables with regard to the mediating role of commitment and organizational citizenship behavior. To answer the question of how much factors such as internal marketing, organizational commitment, and organizational citizenship behavior affect the success of market orientation, 118 employees of the Alborz Province Cooperative Development Bank were also selected as a statistical sample. The face and content validity of the questionnaire was confirmed using the expert opinions of professors, and the reliability of the questionnaire was also confirmed using the Cronbach's alpha calculation method. The data collected were analyzed using two software programs, SPSS19 and Lisrel 8. The results of this analysis also indicated a positive and direct relationship between internal marketing and commitment and citizenship behavior, and commitment and citizenship behavior with market orientation. Also, the relationship between internal marketing and market orientation - commitment and citizenship behavior - and the mediating role of the variable commitment and citizenship behavior in the relationship between internal marketing and market orientation were not confirmed.