This chapter focuses on the Court of Justice of the European Union (CJEU), which comprises two courts: the CJEU and the General Court. It first provides an overview of the CJEU’s structure and functions, and then discusses some of its main rulings and their significance. It further considers rulings on the powers of the institutions, some key legal judgments made in response to questions referred to the CJEU by national courts, the impact of CJEU rulings on EU policy, and post-Maastricht trends in the CJEU and EU law. It also assesses the evolving political reactions towards the judgments of the Court, along with the debate over whether the member states have been able to effectively curb the CJEU’s radical jurisprudence.