Hans Adolf Eduard Driesch, (1867–1941) Emil du Bois-Reymond, (1818–1896) Curt Ducasse, (1881–1969) Pierre Duhem, (1861–1916) Eugen Dühring, (1833–1921) Émile Durkheim, (1858–1917) Manilal Dwivedi, (1858–1898) E Julius Ebbinghaus, (1885–1981) Mary Baker Eddy, (1821–1910) Christian von Ehrenfels, (1856–1932) Albert Einstein, (1879–1955) George Eliot, (1819–1880) Ralph Waldo Emerson, (1803–1882) Friedrich Engels (1820–1895) Rudolf Christoph Eucken, (1846–1926) Julius Evola, (1898–1974) F Thome H. Fang, (1899–1976) Gustav Fechner, (1801–1887) Feng Youlan, (1895–1990) Ernest Fenollosa, (1853–1908) Giuseppe Ferrari, (1812–1876) James Frederick Ferrier, (1808–1864) Ludwig Feuerbach, (1804–1872) Kuno Fischer, (1824–1907) John Fiske, (1842–1901) Franciszek Fiszer, (1860–1937) Robert Flint, (1838–1910) Pavel Aleksandrovich Florenskii, (1882–1937) Georges Florovsky, (1893–1979) Jerome Frank, (1889–1957) Philipp Frank, (1884–1966) Semën Liudvigovich Frank (1877–1950) Gottlob Frege, (1848–1925) Sigmund Freud, (1856–1939) Hans Freyer, (1887–1969) Nikolai Fyodorovich Fyodorov, (1829–1903) G Mahatma Gandhi, (1869–1948) Réginald Garrigou-Lagrange, (1887–1964) Nārāyana Guru, (1856–1928) Giovanni Gentile, (1875–1944) Otto von Gierke, (1841–1921) Charlotte Perkins Gilman, (1860–1935) Étienne Gilson, (1884–1978) Asher Ginsberg (or Ahad Ha'am), (1856–1927) Vincenzo Gioberti, (1801–1852) Arthur de Gobineau, (1816–1882) Henry George, (1839–1897) Antonio Gramsci, (1891–1937) Thomas Hill Green, (1836–1882) Kurt Grelling, (1886–1942) John Grote, (1813–1866) D. V. Gundappa, (1889–1975) G. I. Gurdjieff, (1872–1949) Edmund Gurney, (1847–1888) H Paul Häberlin, (1878–1960) Ernst Haeckel, (1834–1919) Axel Hägerström, (1868–1939) Béla Hamvas, (1897–1968) Eduard Hanslick, (1825–1904) Friedrich Harms, (1819–1880) William Torrey Harris, (1835–1909) Eduard Von Hartmann, (1842–1906) Nicolai Hartmann, (1882–1950)* Charles Hartshorne, (1897–2000) Friedrich Hayek, (1899–1992) Rudolf Haym, (1821–1901) Martin Heidegger, (1889–1976)* Hermann von Helmholtz, (1821–1894) Heinrich Rudolf Hertz, (1857–1894) Alexander Herzen, (1812–1870) Moses Hess, (1812–1875) Sergei Hessen, (1887–1950) David Hilbert, (1862–1943) Dietrich von Hildebrand, (1889–1977) Leonard Trelawny Hobhouse, (1864–1929) William Ernest Hocking, (1873–1966) Shadworth Hodgson, (1832–1912) Eric Hoffer, (1898–1983) Harald Høffding, (1843–1931) Wesley Newcomb Hohfeld, (1879–1918) Oliver Wendell Holmes, Jr., (1841–1935) Max Horkheimer, (1895–1973) Hsiung Shih-li, (1885–1968) Hu Shih, (1891–1962) Elbert Hubbard, (1856–1915) Edmund Husserl, (1859–1938) Thomas Henry Huxley, (1825–1895) I Ivan Aleksandrovich Il'in, (1883–1954) Roman Ingarden, (1893–1970) William Ralph Inge, (1860–1954) Muhammad Iqbal, (1877–1938) J Henry James Sr., (1811–1882) William James, (1842–1910) Alfred Jarry, (1873–1907) Karl Jaspers, (1883–1969)* William Stanley Jevons, (1835–1882)* Rudolf von Jhering, (1818–1892) Krishnamurti Jiddu, (1895–1986) C.E.M. Joad, (1891–1953) William Ernest Johnson, (1858–1931) Jørgen Jørgensen, (1894–1969) Carl Jung, (1875–1961) Ernst Jünger, (1895–1998) K Kang Youwei, (1858–1927) Mordecai Kaplan, (1881–1983) Michael Ivanovich Karinski (1840–1917) Karl Kautsky, (1854–1938) Konstantin Kavelin (1818–1885) Hans Kelsen, (1881–1973) Norman Kemp Smith, (1872–1958) John Maynard Keynes, (1883–1946) Hermann von Keyserling, (1880–1946) Aleksey Khomyakov (1804–1860) Søren Kierkegaard, (1813–1855) Nishida Kitaro (1870–1945) Wolfgang Köhler, (1887–1967) Feliks Koneczny (1862–1949)