Karl Albert Agathon Benary (17 January 1807, Kassel – 4 December 1860, Berlin) was a German classical philologist.
He was the brother of orientalist Franz Ferdinand Benary (1805–1880).
He received his education at the gymnasiums in Göttingen and Erfurt, where he was a student of Franz Ernst Heinrich Spitzner.
From 1824 to 1827 he studied classical philology at the universities of Göttingen and Halle, obtaining his doctorate with the dissertation "De Aeschyli Prometheo soluto".
At Halle he was especially influenced by the teachings of Christian Karl Reisig.
After graduation, he worked as a high school teacher in Berlin, and in the meantime, continued his philological studies as a pupil of Franz Bopp.
From 1833 up until his death in 1860, he was associated with the Cölnischen Realgymnasium in Berlin.
During this time period, he also gave lectures at the University of Berlin.