This book contains selected contributions presented during the workshop Establishing Filiation: Towards a Social Definition of the Family in Islamic and Middle Eastern Law?, which was convened in Beirut, Lebanon in November 2017. Filiation is a multifaceted concept in Muslim jurisdictions. Beyond its legal aspect, it encompasses the notion of inclusion and belonging, thereby holding significant social implications. Being the child of someone, carrying ones fathers name, and inheriting from both parents form important pillars of personal identity. This volume explores filiation (nasab) and alternative forms of a full parent-child relationship in Muslim jurisdictions. Eleven country reports ranging from Morocco to Malaysia examine how maternal and paternal filiation is established be it by operation of the law, by the parties exercise of autonomy, such as acknowledgement, or by scientific means, DNA testing inparticular and how lawmakers, courts, and society at large view and treat children who fall outside those legal structures, especially children born out of wedlock or under dubious circumstances. In a second step, alternative care schemes in place for the protection of parentless children are examined and their potential to recreate a legal parent-child relationship is discussed. In addition to the countr y-specific analyses included in this book, three further contributions explore the subject matter from perspectives of premodern Sunni legal doctrine, premodern Shiite legal doctrine and the private international law regimes of contemporary Arab countries. Finally, a comparative analysis of the themes explored is presented in the synopsis at the end of this volume. The book is aimed at scholars in the fields of Muslim family law and comparative family law and is of high practical relevance to legal practitioners working in the areaof international child law. Nadjma Yassari is Leader of the Research Group Changes in Gods Law: An Inner-Islamic Comparison of Family and Succession Law at the Max Planck Institute for Comparative and International Private Law while Lena-Maria Mller is a Senior Research Fellow at the Max Planck Institute and a member of the same Research Group. Marie-Claude Najm is a Professor in the Faculty of Law and Political Science at Saint Joseph University of Beirut in Lebanon and Director of the Centre of Legal Studies and Research for the Arab World (CEDROMA).