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In various ways, Marx ascribes a central role to the body in his theoretical and political system. In both his philosophy of praxis and his critique of political economy, the body is presented as a site of forces and needs. This enables Marx to provide a naturalist ground for the dynamics of praxis. It also enables him to define a critical perspective in terms of the effects registered in the body of a structure of domination and exploitation. The aim of the article is to present these themes and to discuss their subsequent treatment by authors such as Merleau-Ponty, Bourdieu and Foucault, while reflecting on the way recent transformations of capitalism have led to their reformulation and to the emergence of two new critical tropes: the body as commodity and as an ideology.