The advancements in knowledge and technology in modern global economy in general and economic and industrial developments under China-Pakistan Economic Corridor (CPEC) in Pakistan especially has brought in diverse workforce in business organizations in Pakistan. This situation imposed new challenges on Pakistani human resource sector in managing the complex human resource as for as diversity is concerned. Recently, the view to look at Workforce Diversity Management has been transformed to a deliberate theory of Organizational Performance. This perspective required a research to investigate the impact of Workforce Diversity Management (WDM) on Organizational Performance (OP) of business organizations under current developments of China-Pakistan Economic Corridor (CPEC) in Pakistan. The WDM had been studied diversity of nationality, culture and ethnicity in business organizations. The research is of descriptive nature with a targeted population of 15 business organizations who are currently employed at different projects of China Pakistan Economic Corridor (CPEC). A pre-test has been done with a number of respondents and the full study has been carried out using survey of 15 business organizations. The Data was collected through primary source of questionnaire. The research used both qualitative and quantitative analytical techniques for data analysis. The recommendations of this study provides a policy model for Pakistani policy makers to consider the findings of this study in order to adopt the relevant policy to face new challenges with regard to diversity management in Pakistani business sector. Supervisor:- Dr. Hassan Rasool