Robert Johann Maria König (11 April 1885, Linz – 9 July 1979, Munich) was an Austrian mathematician. He studied from 1903 to 1907 at the University of Vienna and at the University of Göttingen, where he received his PhD under David Hilbert with thesis Oszillationseigenschaften der Eigenfunktionen der Integralgleichung mit definitem Kern und das Jacobische Kriterium der Variationsrechnung. In 1911 he earned his Habilitation qualification at the University of Leipzig with thesis Konforme Abbildung der Oberfläche einer räumlichen Ecke.