Friedrich Stadler (born July 17, 1951, in Zeltweg, Styria) is an Austrian historian and philosopher and professor for history and philosophy of science at the University of Vienna. He is the founder (in 1991) and long-time director of the Institute Vienna Circle, which was established as a Department of the Faculty of Philosophy and Education of the Vienna University in May 2011. Currently he is a permanent fellow of this department and serves at the same time as the Director of the co-operating Vienna Circle Society, which is the continuation of the former Institute Vienna Circle as an extra-university institution.