August Sauer (12 October 1855, in Wiener Neustadt – 17 September 1926, in Prague) was an Austrian Germanist and literary historian.
He is known for his publication of collected works by Franz Grillparzer, Ferdinand Raimund, Adalbert Stifter, et al.
He studied philology and history at the University of Vienna as a pupil of Franz Brentano, Ottokar Lorenz and Richard Heinzel.
From 1879 he worked as an instructor and director of the seminar for German philology at the University of Lemberg, and in 1883 became an associate professor of German language and literature at the University of Graz.
In 1886, he succeeded Jakob Minor at the University of Prague, where in 1892 he became a full professor of German language and literature.