The purpose of this study is to examine the international migration of human resources for health (HRH) from ASEAN countries using available datasets. The medical brain drain has been a concern for public health authorities of many developing countries, but there have been relatively few quantitative studies on this problem in ASEAN countries.<BR>There were 30,007 doctors from ASEAN working in OECD countries in 2004. The largest source of doctors in ASEAN was the Philippines, followed by Thailand, Vietnam, Malaysia and Myanmar, according to the data of Bhargave, Docquier, and Moullan (2010). The United States was the biggest recipient of migrant doctors from ASEAN, followed by the United Kingdom, Australia, Canada, and Germany. According to the data made by Dumont and Zurn (2007), which shows the number of all HRH professionals which immigrated to OECD countries circa 2000, the Philippines sent the largest number of doctors and nurses, while Vietnam sent the largest number of dentists and pharmacists.<BR>The study proceeds to examine the determinants of international migration of doctors, nurses, dentists and pharmacists. Dumont and Zurn (2007)'s data as well as WHO and World Bank data were used to analyse the determinants of emigration of HRH professionals at the country level. The result shows that the density of doctors and nurses, the general emigration rate, the proportion of public expenditure in health expenditure, and the existence of English and French speaking population had positive impacts on the per capita outflow of HRH migration to OECD countries, while the Gini Index had a negative impact. The analysis also indicates that there are differences in the size and impact of emigration of HRH among ASEAN countries.<BR>There are some limitations to the study. First, the study did not analyse HRH migration between ASEAN countries. Secondly, the study did not analyse the bilateral relationship between a source country and a destination country. Finally, the study did not distinguish between a temporary destination country and a final destination country of HRH migration.