In the past decade, there has been a trend towards the global “harmonization” of migration statistics, largely inspired by international bodies and organizations that require comparative data. This volume provides an accessible account of the history of migration measurement in Europe and analyzes the current conceptualizations of migration and data-gathering procedures across twelve European countries. Based on this analysis, the authors provide critical insight into the migrant stocks and flows in their own countries and comment on recent trends in migration scholarship, such as the feminization of migration or the diversification of migrant’s origins.