The present study was conducted on the employees of service businesses in a shopping center (mall) in Kayseri, Turkey. The objective was to investigate the mediating role of organizational justice between the internal marketing practices of businesses and the task and contextual performance of employees. A model was created to realize the objective. In this model, the perception of organizational justice was considered with distributive, procedural and interactional justice sub-dimensions and performance criteria were considered with contextual and task performance sub-dimensions. Data gathered from 157 service business employees were used to test the hypothesis. Initially, the effects of the internal marketing practices of businesses on employees perceptions of organizational justice were evaluated and meaningful effects were observed. In the second phase, the effects of internal marketing practices on task and contextual performance were evaluated and it was concluded that internal marketing practices had significant positive effects on employee performance. In the last phase of the study, the mediating role of organizational justice between internal marketing practices and employee performance was evaluated and it was observed that procedural and interactional justice had a mediating role between internal marketing practices and task performance and procedural justice had a mediating role between internal marketing practices and contextual performance. Distributive justice did not have any mediating role in these relationship