Philosophy of space-time physics, as opposed to the more general philosophy of space and time, is the philosophical investigation of special and general relativity. Relativity theory stimulated immediate and deep philosophical analysis, both because of its novel implications for the nature of space, time and matter, and because of more general questions philosophers have about the nature of its claims. With nearly one hundred years of sustained research to draw on, this chapter cannot hope to

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... rvey all the topics that have arisen, even all the major ones. Instead, we concentrate on four topics, two with a historical and philosophical pedigree, namely, relationalism and conventionalism, and two that arise in general relativity and cosmology, namely, singularities and the so-called horizon problem. This selection should give the reader a representative taste of the field as it stands today. Many fascinating topics, however, will not be covered. Notable examples are the topics of time travel, presentism, supertasks, and the Lorentz interpretation of relativity. For up-to-date references and discussions of these topics, the reader can turn to, respectively, Arntzenius and Maudlin (