Otto Liebmann (; 25 February 1840 â 14 January 1912) was a German neo-Kantian philosopher.
Otto Liebmann was born in Löwenberg, Silesia, into a Jewish family, and educated at Jena, Leipzig and Halle. At Jena, he was a student of Kant scholar Kuno Fischer.
Liebmann was made professor at Strassburg in 1872 and at Jena in 1882.
He died in Jena.
The mathematician Heinrich Liebmann was his son and the physician Otto Liebmann is his eponymous great-grandson.
A forerunner of neo-Kantianism, in his best-known book, Kant und die Epigonen (1865), he deals with the philosophy after Kant, discussing Fichte, Schelling, Hegel, Fries, Herbart and Schopenhauer. Having credited Kant's philosophy (though criticizing it on the vital point of accepting a thing-in-itself), he focuses on what he sees as the shortcomings in the approaches of Kants successors. He frequently ends a section with the statement that one should return to Kant.
<blockquote>Kant is, without a doubt, the most significant thinker of the Christian period.</blockquote>
Liebmann's work also influenced his Jena colleague Gottlob Frege.