This book explores the prospects of a global labour law system. Global labour law is understood as a still non-coherent set of norms that at different levels and with different legal effectiveness regulate legal labour relations, promote respect for fundamental social rights, and condition the behavior of the multinational enterprise, from a social justice and sustainability perspective. The book deals with both international labour law and regulatory instruments of different kinds, such as social clauses in international trade treaties or corporate codes of conduct, transnational collective bargaining, and EU directives on due diligence. This complex normative "system" is partly reconstructed and partly subjected to critique, with the aim of producing a hybrid handbook in which the elements of normative knowledge are accompanied by problematic reasoning about the forms, contents and purposes of a possible global labour law. The book will be of interest to academics, researchers and policy-makers working in the areas of Labour Law, Employment Law, International Human Rights Law and Social Justice.