This collection of essays presents an interdisciplinary investigation by lawyers and philosophers into the philosophical ideas, concepts, and principles that provide the foundation for the field of labour law and employment law. The book addresses the doubts that have been expressed about whether a body of labour law that protects workers is needed at all, what should be regarded as the proper scope of the field in the light of developments such as the integration of work and home life by means of technology, the globalization of the economy, and the precarious kinds of work that thrive in the gig economy. Paying particular attention to political philosophy and theories of justice, the contributions focus on four themes: I. freedom, dignity, and human rights; II. distributive justice and exploitation; III. workplace democracy and self-determination; and IV. social inclusion.