This chapter explores some of the ways in which health geographers have debated, contested and adapted ideas and concepts drawn from contemporary discussions of posthumanism. It briefly introduces the key features of posthuman, nonhuman and more-than-human geographies, before considering how health geographers have contributed to these discussions. It presents the ideas, concepts and controversies of key relevance for health geographers, highlights the most engaging and innovative of contemporary researches and briefly maps some possible future directions for health geography after the posthuman turn. Posthumanism overturns the schism in favor of an ontological flattening of inside and outside, structure and agent, and a novel focus on networks or assemblages of health and illness. This ontological flattening, with its associated focus on networks and assemblages, entails a profound reorientation of the aims and methods of theoretical and empirical inquiry in health geography.