To end statelessness worldwide by 2024. That is the ambition of the #ibelong campaign, spearheaded by UNHCR, which aims to galvanise governments, civil society, UN agencies and others into action. It is a bold but appropriate objective. Statelessness has been a cause of human suffering for too long, and unnecessarily so: it is a man-made phenomenon and bringing it to an end is - at least in theory - entirely feasible. The Institute on Statelessness and Inclusion is committed to helping to inform and catalyse solutions for statelessness. In the hope of contributing to a better sense of the task ahead, this inaugural World's Stateless report explores currently available statistical data and discusses the challenges involved in accurately mapping or quantifying statelessness. From this analysis, the report distils recommendations to states, UNHCR and civil society on how to improve data collection and reporting on statelessness.The Institute on Statelessness and Inclusion is an independent, non-profit organisation dedicated to leading an integrated, inter-disciplinary response to the injustice of statelessness and exclusion. Established in August 2014, it is the first global centre of expertise and action committed to promoting the rights of stateless persons and reducing statelessness worldwide. We believe in the value of research, education, partnership and advocacy. We aim to develop and share our skills and expertise with partners in civil society, academia, the UN and governments, and to serve as a catalyst for change.