 While Sartre’s public renown remains, his work has had less academic attention in the last thirty or so years ago, and earlier in France, dating roughly from the rise of “post-structuralism” in the 1960s. Although Gilles Deleuze dedicated an article to his “master” in 1964 in the wake of Sartre’s attempt to refuse the Nobel Prize for literature (Deleuze 2004), Michel Foucault influentially declared Sartre’s late work was a “magnificent and pathetic attempt of a man of the nineteenth century to think the twentieth century” (Foucault 1966 [1994:   541–2])[1].  In this entry, however, we seek to show what remains alive and of ongoing philosophical interest in Sartre, covering many of the most important insights of his most famous philosophical book, Being and Nothingness. In addition, significant parts of his oeuvre remain under-appreciated and thus we seek to introduce them. Little attention has been given to Sartre’s earlier, psychologically motivated philosophical works, such as Imagination (1936) or its sequel, The Imaginary (1940). Likewise, few philosophers have seriously grappled with Sartre’s later works, including his massive two-volume Critique of Dialectical Reason (1960), or his various works in existential psychoanalysis that examine the works of Genet and Baudelaire, as well as his multi-volume masterpiece on Flaubert, The Family Idiot (1971–2). These are amongst the works of which Sartre was most proud and we outline some of their core ideas and claims. 