Theodor Heinrich Gottfried Keil (25 May 1822, Gressow – 27 August 1894, Friedrichroda) was a German classical philologist.
[1] He studied classical philology at the Universities of Göttingen and Bonn, receiving his doctorate in 1843 with a textual critique on the Roman poet Propertius.
After his return to Germany, he became an instructor at the Francke Foundation Pädagogium in Halle an der Saale.
[2] In 1859 he was named successor to Carl Friedrich Nagelsbach as chair of classical philology at the University of Erlangen.
In 1869 he became a full professor of classical philology at the University of Halle as a successor to Theodor Bergk.