This unique book offers a comprehensive systematization and overview of the EUs emerging 'acquis' and practice of Collective Labour Law. Although the core aspects of Collective Labour Law lie outside the EU's competence to regulate, the laws and industrial relations systems of Member States are undoubtedly influenced by the EU, and the involvement of Social Partners, i.e. representatives of employers and workers, is essential for many aspects of EU law and policy. Featuring contributions from scholars and practitioners from across Europe, the first part of the book provides an introduction to key aspects, theories and topics of EU Collective Labour Law, including discussion of relevant EU law and case law of the Court of Justice of the EU. Chapters then move on to analyse and reflect on the most fundamental and challenging subtopics, questions and issues in this area, engaging with current debates and potential future developments. Respecting differences in views, approaches, and evaluations, it offers a variety of perspectives on the relationship between Collective Labour Law and the EU. Scholars and students of EU and labour law will find this book an essential resource. Its critical examination of contemporary and future issues will also prove useful for practitioners, social partners and policymakers across the EU.