This paper aims at exploring a particular dimension of the affinity between Gilles Deleuze and pragmatism: his ontology of the virtual, which results in a metaphysics of power. In Deleuze’s reading of Spinoza, the essence of an entity is identical to its power: what can it do? substitutes the Socratic ti esti? as the leading philosophical question. This shift, operated by Spinoza and given a new and adequate ontology by Deleuze, is very close to Peirce’s pragmatic revolution: if Deleuze’s virtual (...) ideas are identical to the range of variations in power and affects that a body may go through, Peirce defines meaning in terms of the whole range of possible effects that an idea would produce if taken to be true. Contradictory as it may sound, the concept of the virtual entails something like a pragmaticism of the singular, which informs every aspect of Deleuze’s philosophy: his doctrine of faculties and his theory of praxis will be used as instances of this pervasiveness. This pragmatist reading of Deleuze could possibly shape an alternative path for contemporary pragmatism: instead of valorising its “edifying” (linguistic, historicistic, humanistic) tendency, Deleuze allows to highlight the vitality of the second vein of pragmatism, the “constructive,” empiricist, speculative, even metaphysical one. (shrink)