The territorial politics of health is both underexploited by mainstream political scientists and the subject of a large and distinctive health policy literature that rarely connects with political science. This chapter first argues for the usefulness of health as a source of data for a more grounded and policy-focused territorial politics. It then summarizes the health policy approach to territorial politics, arguing that its empirical findings, more than its theories, can enrich political science on the topic. Subsequently, it turns to the findings of political scientists, highlighting the extent to which comparative welfare state literature is skeptical about federalism and could handle it much better, and the extent to which the literature about federalism and health is mostly nationally specific and overrepresents North American experiences. The last sections turn to some findings for comparative territorial politics from health policy studies, and some potential future directions for research. Health policy is both an important and a frustrating topic for research in territorial politics. It is important because in many countries it is, along with education, one of the most important expenditure items for local and regional government. To write about states in Brazil or the U.S., regions in Italy or Spain, or devolved authorities in the UK without writing about health is to ignore a huge part of what they do and what their politicians must think about. Furthermore, study of health and territorial politics could shed light on some of the knottiest problems in comparative politics. For territorial politics scholars, understanding health better would mean not just understanding one of the most important areas of public expenditure, but also would shed light on the kinds of variation that are common in decentralized states but obscured by a focus on legislation. Such variation happens, and matters, in organization, budgeting, staffing, and priorities within the public sector. Studying health also opens up new empirical approaches to problems in territorial politics such as the challenges of multi-level coordination and the diffusion of ideas and learning. For scholars in social policy and comparative political economy, understanding health care and policy better would free them from a tendency to focus on pensions and unemployment insurance as representations of the whole welfare state (e.g.(Esping-Andersen 1990, Hicks 1999) and come to grips with the complexity and complex knowledge politics that characterize the modern state (Jasanoff 2004a). Health is also a frustrating topic, particularly for comparative research. Compared to other policy areas, part of the problem is that it is so difficult to characterize programs or understand causality. For example, we can calculate expenditure on unemployment or pensions by multiplying unemployment pay or pensions by the number of people legally entitled to them. In health, calculating need, desires, expenditure, or entitlement is very difficult. If everybody is essenti...