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การลงทุนโดยตรงในกลุ่มประเทศอาเซี ยนชั้ นน�ำ 302 The Journal of the Royal Society of Thailand Vol. 41 No. 2 April-June 2016 Abstract Foreign Direct Investment in Leading ASEAN Countries Pornchai Chunhachinda Associate Fellow of the Academy of Moral and Political Sciences, The Royal Society of Thailand Foreign Direct Investment (FDI) has been one of the most popular method of international investment for quite a long time. This can be confirmed by the stock of FDI for both inflow and outflow which are accounted for over 30 percent of world GDP. Developed countries are found to have higher portion of FDI outflow than inflow, while developing countries have higher portion of FDI inflow than outflow due to insuf- ficient fund to develop the countries. For 10 ASEAN countries, during the 13 years from 2003 to 2015, the stock of FDI inflow is as high as 10.4 trillion U.S. dollar. Singapore has received the most highest amount of 5.3 trillion U.S. dollar. The other 5 leading ASEAN countries namely Indonesia, Malaysia, the Philippines, Thailand and Vietnam received 4.7 trillion U.S. dollar. The rest four small ASEAN countries received only 4 billion U.S. dollar of FDI inflow during those thirteen years period. In addition, the empirical study on determinants factors of FDI inflow to 6 leading ASEAN countries has found 4 significant factors which are big market size, good investment climate, low unemployment and good infrastructure. Keywords: Foreign Direct Investment, Leading ASEAN countries, Determinant Factors of FDI Inflow.