Isidor Hilberg (born May 28, 1852, at Byelaya Tzerkov, Ukraine; died October 28, 1919 in Vienna), was an Austrian classical scholar.
In 1856 he went with his parents to Vienna, where he received his early education.
Subsequently he studied classical philology at the University of Vienna under Vahlen, Gomperz, Hoffmann, and Hartel (Ph.D.
1874).
In 1875, he studied for half a year in Italy, and became privatdozent in classical philology at the University of Vienna in 1877.
In 1879 he was appointed assistant professor at Prague University, and in 1882 professor at the University of Czernowitz, of which he was "Rector Magnificus" in 1898.
He is now best known for his three-volume edition of the letters of St.
Jerome in the Corpus Scriptorum Ecclesiasticorum Latinorum.