This chapter provides an introduction to Competition Policy and law in the European Union (EU). There are three sets of rules: one relating to the activities of legal persons—that is, the business undertakings, which now includes rules on concentrations and mergers; one relating to anti-dumping measures; and, finally, one relating to the activities of the member states, principally state aid. The rules concerned with private undertakings are further subdivided into: Article 101 TFEU for agreements between cartels involving more than one entity; Article 102 TFEU, concerned with dominant positions, dealing predominantly with one entity but also applicable to one or more undertakings; and the rules applicable to concentrations and mergers.