Few elements of Aristotle’s practical philosophy have been more discussed than the so-called “practical syllogism”. But there are also few as suggestive to the commentators as this one. In this article I intend to define what the theory of practical syllogism would consist in, as a separated element within the Aristotelian ethical theory (or, more precise-ly, within his theory of action). It is not properly a demonstration of the existence of such a theory, but rather of the possibility that it can take its place, even a necessary one, into the Stagirite’s general theory of action, in spite of some difficulties that I try to solve. This conclusion is reached through an analysis of the main elements of this theory.