Ludwig Radermacher (31 October 1867 – 28 June 1952) was a German-Austrian classical philologist born in Siegburg.
Following graduation he remained in Bonn, where he assisted Usener with the works of Dionysius of Halicarnassus.
In 1909 he succeeded Theodor Gomperz (1832-1912) as chair of classical philology at the University of Vienna, and where he remained until his retirement in 1937.
Radermacher specialized in research of classical rhetoric, folklore and mythology.
Among his many written works was an edition of Quintilian's twelve-volume book on best practices in education of a young orator, "Institutio Oratoria".