With the current success and proliferation of Henri Lefebvre’s phrase “the production of space,” it becomes increasingly necessary to oppose its banalization by revealing the philosophical sources of this concept and preventing the isolation of the thesis that space is socially produced from other dimensions of his theory. Of paramount import in this regard is Lefebvre’s argument that space is a concrete abstraction.1 In this chapter I would like to assert that the concept of concrete abstraction brings together the most vital elements of Lefebvre’s theory of production of space, relating it to his rethinking of the philosophies of Hegel and Marx as well as studies of postwar French architecture and urbanism. In so doing, I wish to show in particular how Lefebvre’s approach to space as a product of historically specific material, conceptual, and quotidian practices was facilitated by his use of the concept of concrete abstraction.This requires a brief discussion of its Hegelian origins, before examining three appropriations of concrete abstraction by Marx to highlight their mobilization in Lefebvre’s theory.