Certainly Sartre had an enormous influence on the subsequent philosophical thought, primarily in France. Rene Girard did not ignore this thinker either. In this article we will look at the influence of Sartre’s philosophy on the formation of Rene Girard’s mimetic theory. Already in his early work, “Deceit, Desire and the Novel: Self and Other in Literary Structure”, Rene Girard repeatedly refers to the work of Sartre, explaining how his work can be considered in the context of mimetic theory. Further, in an interview with Michel Treger in 1992, Girard controversially proposes to examine the existential-phenomenological constructions of Sartre by means of mimetic theory, putting forward his vision and critical view on overcoming the Cartesian dualism that Girard finds in Sartre’s philosophy. The author of the article considers the convergence of the mimetic theory of R. Girard with some provisions of the work by J.-P. Sartre, turning to one of the main philosophical works of J.-P. Sartre “Being and Nothingness”, which also influenced the early work of R. Girard. It should be noted that J.-P. Sartre does not offer a system describing the mechanisms of mimetic desire. But through the prism of mimetic theory we can see certain philosophical intuitions that reveal to us the nature of mimetic desires in the works of Sartre.