Johann Hauler (October 9, 1829 – August 9, 1888) was an Austrian educator and classical philologist born in Oberrimsingen, a district of Breisach, Germany. He was the father of Edmund Hauler (1859–1941), a professor of classical philology at the University of Vienna.
He studied classical and Romance philology at the University of Bonn under Friedrich Wilhelm Ritschl (1806–1876) and Friedrich Gottlieb Welcker (1784–1868), then at the University of Freiburg with Theodor Bergk (1812–1881), and finally in Paris. After earning his doctorate in 1855 he taught ancient languages and French at the "German Gymnasium" in Ofen.
In 1860 he relocated to Vienna as Oberlehrer at the Theresianum, then held then same position from 1862 at the Akademischen Gymnasium. In 1877 he was appointed director of the Staatsgymnasiums Wien II (Vienna State Gymnasium II). In 1880 he became a member of the Mitglied des Landesschulrats für Niederösterreich.
He was the author of Lateinisches Übungsbuch (Latin Workbook), which was published until 1938 in 32 editions. He died on August 9, 1888 in Trautmannsdorf an der Leitha.