This chapter considers a comparative assessment of constitutional provisions for the relative responsibilities of central and subnational government and how they interact, or “multi-level governance”, in selected OECD countries. It aims to identify how countries have included arrangements for multi-level governance and territorial organisation in their constitutions, and highlights that they vary greatly across constitutions. First, the chapter introduces the different categories of multi-level governance in the selected countries. Second, it presents a cross-country comparison of six foundational themes and related sub-themes through which multi-level governance arrangements and territorial organisation can be determined constitutionally. These themes are territorial organisation, structure of sub-national government, division of powers and responsibilities, finance mechanisms, impact on central state decision-making, and co-ordination mechanisms. In doing so, it provides specific examples of how benchmarked countries have included provisions regarding these themes and subthemes in their constitutions.