Islamic Banking is form of banking in which the transactions are based on Shariah (Islamic Laws) and all the financial transactions/activities are carried through or with according to the Islamic rules and regulations. This research targeted to determine the Islamic Banking financing effect on economic growth of Muslim populated Asian countries including Bangladesh, Brunei, Indonesia, Malaysia, and Pakistan. This research employs the multiplying mediating approach by utilizing the yearly panel data (2005-2019) along with interviews from relevant industry experts and review of policies/guidelines issued by State Bank of Pakistan from time to time on Islamic Banking. Overall, the finding suggests that there is no direct significant effect of Islamic banking financing on economic growth. Nevertheless, it concludes that Islamic banking financing possesses significant indirect effect on economic growth via mediating variables like investment and consumption. In conclusion, our research recommends that future economic analysis and policies should focus on the Islamic finance-growth nexus via Islamic banking development in order to stimulate sustainable economic development in nations. Further, it tends the authorities to work on the solutions of possible challenges and issues faced by the Islamic banking industry and mull over its regulatory, institutional, governmental, and political factors and it influence. It further puts emphasis on promoting sharia research for an innovative and efficient banking system Supervisor:-Dr. Farhat Mahmood Co-Supervisor:-Dr. Ahsan ul Haq Satti