The purpose of this study is to test whether there is a mediating effect of private security officers’ police cooperation perception on the relationship between job satisfaction and occupational commitment. The population of the study includes the private security officers working in Bursa. Random sampling is conducted in the study. As a result of the questionnaire, 702 data were found analyzable. In this study, the Job Satisfaction Scale developed by Weiss et al. (1967), the Occupational Commitment Scale developed by Meyer et al. (1993) and Private Security Police Cooperation Level Scale developed by the researcher were used. According to the result of the study, it was revealed that there is a positive relationship between job satisfaction and occupational commitment, and police cooperation perception partially mediates this relationship.