Karl August
Karl-August may refer to:
- Adam Karl August von Eschenmayer, German philosopher and physician
- Christian Karl August Ludwig von Massenbach, Prussian soldier
- Eduard Karl August Riehm, German Protestant theologian
- Friedrich Karl August, Prince of Waldeck and Pyrmont, Prince of Waldeck and Pyrmont
- Hans Karl August Simon von Euler-Chelpin, German-born Swedish biochemist
- Johann Karl August Musäus, German author from Jena
- Karl August, 10th Prince of Thurn and Taxis, tenth Prince of Thurn and Taxis
- Karl August, Grand Duke of Saxe-Weimar-Eisenach, duke of Saxe-Weimar and of Saxe-Eisenach
- Karl August, Hereditary Grand Duke of Saxe-Weimar-Eisenach, Hereditary Grand Duke of Saxe-Weimar-Eisenach
- Karl August, Prince of Waldeck and Pyrmont, Prince of Waldeck and Pyrmont
- Karl August Alten, Hanoverian and British soldier
- Karl August Auberlen, German Lutheran theologian
- Karl August Bottiger, German archaeologist and classicist
- Karl August Devrient, German stage actor
- Karl August Ehrensvard, Swedish naval officer, painter, author, and neo-classical architect
- Karl August Einbund, Estonian journalist, politician and head of state
- Karl August Engelbrekt Ahlqvist, Finnish poet, scholar of the Finno-Ugric language, author, literary critic
- Karl August Ferdinand von Borcke, Prussian general, first recipient of the Iron Cross
- Karl August Folkers, American biochemist, working at Merck
- Karl August Friedrich Mahn, German philologist and language teacher and researcher
- Karl August Genzken, physician, conducted human experiments on prisoners of concentration camps
- Karl August Görner, German actor, director and playwright
- Karl August Hanke, official of the National Socialist German Workers Party
- Karl August Haraldsen, Norwegian merchant
- Karl August Hase, German Protestant theologian and Church historian
- Karl August Katzer, Sorbian composer and conductor
- Karl August Lossen, German petrologist and geologist
- Karl August Mobius, German zoologist
- Karl August Nerger, naval officer of the Imperial German Navy in World War I
- Karl August Nicander, Swedish lyric poet
- Karl August Offman, Mauritian politician
- Karl August Otto Hoffmann, German botanist and a high school teacher in Berlin
- Karl August Ramsay, Finnish politician
- Karl August Reinhold Wunderlich, German physician, pioneer psychiatrist, medical professor
- Karl August Steinheil, German physicist, inventor, engineer and astronomer
- Karl August Varnhagen von Ense, German biographer, diplomat and soldier
- Karl August von Bergen, German anatomist and botanist
- Karl August von Hardenberg, Prussian statesman and Prime Minister of Prussia
- Karl August von Heigel, German novelist
- Karl August Wilhelm Frenzel, the commandant of Sobibor extermination camp's Lager I section
- Karl August Wittfogel, German-American playwright, historian, and sinologist
- Karl August Wuensche, German Christian Hebraist
- Karl-August Fagerholm, Speaker of Parliament and three times Prime Minister of Finland
- Karl-August Freiherr von Bülow, highly decorated Oberst in the Wehrmacht during World War II
- Karl-August von Reisach, German Catholic theologian and Cardinal
- Kraft Karl August zu Hohenlohe-Ingelfingen, Prussian general and military writer
- Max Karl August Bruch, German Romantic composer and conductor