Due to the increasing importance of cultural diversity in organizations with globalization, the management of cultural diversity and the effect of this management on organizational performance are the subject of the study. The survey method was used to collect the data, and the related survey was applied to the employees of the telecommunication companies in Iraq. As a result of the analysis, it has been determined that cultural diversity management increases organizational performance with a strong effect coefficient. It has been determined that all components of cultural diversity such as color blindness, justice, equal access, cultural integration and learning have a significant impact on organizational performance. In particular, it can be said that organizations with culturally different workforces have a managerial contribution to the scope of the research, considering cultural diversity while determining their strategies. In addition, it should be ensured that the improvement of organizational performance is better understood and that the factors affecting organizational performance are clearly known by the employees. As a result of an organization's ability to effectively manage its culturally diverse workforce, it will be possible to satisfy a multicultural market and be preferred by multicultural customers. The fact that the research was carried out in a single sector can be expressed as a constraint.