Karl-August may refer to: Adam Karl August von Eschenmayer (1768–1852), German philosopher and physician Christian Karl August Ludwig von Massenbach (1758–1827), Prussian soldier Eduard Karl August Riehm (1830–1888), German Protestant theologian Friedrich Karl August, Prince of Waldeck and Pyrmont (1743–1812), Prince of Waldeck and Pyrmont Hans Karl August Simon von Euler-Chelpin (1873–1964), German-born Swedish biochemist Johann Karl August Musäus (1735–1787), German author from Jena Karl August, 10th Prince of Thurn and Taxis (1898–1982), tenth Prince of Thurn and Taxis Karl August, Grand Duke of Saxe-Weimar-Eisenach (1757–1828), duke of Saxe-Weimar and of Saxe-Eisenach Karl August, Hereditary Grand Duke of Saxe-Weimar-Eisenach (1844–1894), Hereditary Grand Duke of Saxe-Weimar-Eisenach Karl August, Prince of Waldeck and Pyrmont (1704–1763), Prince of Waldeck and Pyrmont Karl August Alten (1764–1840), Hanoverian and British soldier Karl August Auberlen (1824–1864), German Lutheran theologian Karl August Bottiger (1760–1835), German archaeologist and classicist Karl August Devrient (1797–1872), German stage actor Karl August Ehrensvard (1745–1800), Swedish naval officer, painter, author, and neo-classical architect Karl August Einbund (1888–1942), Estonian journalist, politician and head of state Karl August Engelbrekt Ahlqvist (1826–1889), Finnish poet, scholar of the Finno-Ugric language, author, literary critic Karl August Ferdinand von Borcke (1776–1830), Prussian general, first recipient of the Iron Cross Karl August Folkers (1906–1997), American biochemist, working at Merck Karl August Friedrich Mahn (1802–1887), German philologist and language teacher and researcher Karl August Genzken (1885–1957), physician, conducted human experiments on prisoners of concentration camps Karl August Görner (1806–1884), German actor, director and playwright Karl August Hanke (1903–1945), official of the National Socialist German Workers Party (Nazi Party) Karl August Haraldsen (1889–1959), Norwegian merchant Karl August Hase (1800–1890), German Protestant theologian and Church historian Karl August Katzer (1822–1904), Sorbian composer and conductor Karl August Lossen (1841–1893), German petrologist and geologist Karl August Mobius (1825–1908), German zoologist Karl August Nerger (1875–1947), naval officer of the Imperial German Navy in World War I Karl August Nicander (1799–1839), Swedish lyric poet Karl August Offman (born 1940), Mauritian politician Karl August Otto Hoffmann (1853–1909), German botanist and a high school teacher in Berlin Karl August Ramsay (1791–1855), Finnish politician Karl August Reinhold Wunderlich (1815–1877), German physician, pioneer psychiatrist, medical professor Karl August Steinheil (1801–1870), German physicist, inventor, engineer and astronomer Karl August Varnhagen von Ense (1785–1858), German biographer, diplomat and soldier Karl August von Bergen (1704–1759), German anatomist and botanist Karl August von Hardenberg (1750–1822), Prussian statesman and Prime Minister of Prussia Karl August von