This working paper provides an overview on the discussion of international health worker migration in Europe. It summarizes general labour migration trends, namely in the context of European Union enlargement, looks at information on health worker flows and at migration influencing aspects such as policies managing migration, professional regulation, and demographic and labour-related determinants such as ageing and working conditions. The paper also includes four country case studies, which provide a comprehensive basic overview for each country on health labour market and workforce issues as a background, and the information available on international migration of health workers within the countries. In addition, the paper presents an overall summary of the issues.