This chapter outlines the framework for enforcement of European Union (EU) law, and describes the various actions that may be brought before the Court of Justice (CJ). In interpreting the relevant provisions of the Treaty on the Functioning of the European Union (TFEU), the CJ has played a key role in the enforcement of EU law, especially with its insistence on the effective protection of individuals’ Union rights. The chapter also explains the significance of judicial review in the EU legal order by focusing on the jurisdiction of the CJ in the appeal cases originating from the General Court (GC). Finally, the chapter outlines how questions of infringement of EU law can also be raised in the national legal system.