Abstract: This chapter examines how mergers, acquisitions, and restructuring are regulated, both within the formal body of corporate law and as that law interacts with other bodies of law such as securities (including listing standards), antitrust, industry-specific regulation, and regulations of cross-border transactions. It begins with an overview of relevant terminology and scope of M&A and restructuring and how they differ from other corporate transactions or activities. It then considers major types of M&A transactions, the core goals of corporate law or governance, and other bodies of law (antitrust, industry-based regulation, regulation of foreign ownership of business, and tax) that give special treatment to M&A and restructuring, and sometimes interact with corporate law and governance. It also looks at laws that constrain M&A transactions and those that facilitate them. It concludes by summarizing empirical research and discussing what variations in types and modes of regulation governing M&A and restructuring transactions imply.