Imre Gyula Izsák (Zalaegerszeg, Hungary, February 21, 1929 – Paris, France, April 21, 1965) was a Hungarian mathematician, physicist, astronomer, and celestial mechanician.
His father, Gyula Izsák, taught geography and biology in Zalaegerszeg.
His mother, Aranka Pálfi, was a mathematics and physics teacher.