The focus of this chapter is on the European Union administrative law that has arisen in the specific policy setting of the internal market. The creation of the internal market, which ‘shall comprise an area without internal frontiers in which the free movement of goods, persons, services and capital is ensured’, is at the heart of the European Union integration project and consequently also of the EU’s administrative network structure. A number of the other chapters that follow in this collection are closely related to the present discussion, either through the specific type of product concerned, or by virtue of exploring a particular policy objective intertwined with the broader framework of the internal market. This chapter concentrates on the internal market and its administration more narrowly understood. Its focus is mainly on the administrative tasks, structures, procedures, and enforcement in the field of product regulation. However, this should not overlook the extent to which the underlying provisions, principles, and practices in this field relate, more widely, to the whole body of EU administrative law.