The Statelessness Index is a comparative tool that assesses European countries’ law, policy and practice on the protection of stateless people and the prevention and reduction of statelessness, against international norms and good practice. It is a tool created for civil society, government, researchers, the media and other interested individuals. The Index was developed and is maintained by the European Network on Statelessness (ENS). The Index allows users to quickly understand which areas of law, policy and practice can be improved by states and which can be looked to as examples of good practice in addressing statelessness. The Index is the first to provide comprehensive and accessible comparative analysis of European countries’ efforts to address statelessness. The Index assesses how countries in Europe perform against international norms and good practice for the protection of stateless people and the prevention and reduction of statelessness. A country’s performance is assessed against a set of benchmarks drawn from international and regional human rights standards, soft law, relevant reports, and consultation with experts. The index covers 18 countries for the period 2017-2019. It consists of 23 indicators sorted in 5 strands: International and regional instruments; Statelessness Population Data Availability; Statelessness Determination and Status; Detention; Prevention and Reduction. The country data is gathered through a detailed survey, structured around the themes and subthemes. The surveys are completed by country experts (researchers, lawyers, NGOs and other civil society actors), referenced with links to sources, reviewed by a second country expert, and then returned to the ENS Secretariat for analysis.