In the framework of the existentialphilosophy of Jean-Paul Sartre, Stoicism is a dialogical benchmark to understand the sense in which the human being is free and takes on that responsibility. In his autobiographical writings,as well as in his phenomenological and marxistphilosophical works, Sartre reads the Stoics to define, closer or farther away from Stoicism,some of his main philosophical theses. In this way, from a interpretative perspective, we like to show Sartre’s different readings of Stoicismin his autobiographical writings, as well as in the leading phenomenological existentialism and marxist existentialism, in terms of the categoriesof assumption and freedom.