This chapter uses Diogenes Laertius’ doxographical overview of Stoic natural philosophy as a starting point to examine the role of physics in Marcus Aurelius’ Meditations. Contrary to a common misconception, all the central aspects of Stoic physics, except for some more technical issues, are well represented. The chapter discusses Marcus Aurelius’ treatment of the telos-formula of ‘living according to nature’; the two fundamental Stoic principles of reality, god and matter; the scale of nature; and the relation between Providence, fate, necessity, change, human action, and freedom. Marcus Aurelius’ distinctive touch comes through in certain areas of emphasis, such as the centrality of sociability, human and divine, or the many implications of the view that the processes of change that also entail human mortality actually constitute the order of the universe.