This chapter first considers the process by which Acts of Parliament come into being. It then turns to delegated legislation—that is, law that is made by other bodies under Parliament’s authority. Next, it looks at EU legislation, which had an increasingly significant effect from the time that the UK joined the European Economic Community in 1973. It explains the various institutions of the EU and their role in the law-making process; the different types of EU legislation; and the circumstances in which individuals may use them in domestic courts, pre-Brexit. Finally, the chapter discusses the impact of the European Convention on Human Rights and the Human Rights Act 1998.