Eugen Diederichs (June 22, 1867 – September 10, 1930)^[1] was a German publisher born in Löbitz, in the Prussian Province of Saxony.

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Diederichs started his publishing company in Florence, Italy, in 1896.^[2] He moved on to Leipzig,^[3] where he published the early works of Hermann Hesse, and from there to Jena in 1904.^[4] He started publishing the magazine Die Tat in 1912.^[5] His publishing firm, the Eugen Diederichs Verlag, played a central role in Germany's neo-conservative or revolutionary conservative movement in the late 19th and early 20th century.^[6]

Diedrichs married Helene Voigt in 1898; the couple separated in 1911.^[3] He married the writer Lulu von Strauß und Torney [de] in 1916.^[7] Diederichs died in Jena in 1930.

Since 1988, Diederichs has become an imprint of the Hugendubel publishing house.^[4]