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Philosophers (and others important in the history of philosophy), listed alphabetically:
- Note: This list has a minimal criterion for inclusion and the relevance to philosophy of some individuals on the list is disputed.
 
I
- Iamblichus (c. 245 – c. 325 AD)[b][d][e]
 - Yahya ibn Adi (893–974)[d]
 - Ibn Arabi (1164–1240)[b][d][e]
 - Ibn ar-Rawandi (827–911)[d]
 - Ibn Bajjah (or Avempace) (died 1138)[a][b][d][e]
 - Ibn Daud (or Rabad I or Avendauth, or John of Spain) (1110–1180)[a][d][e]
 - Abraham ibn Ezra (1092/3–1167)[d][e]
 - Moses ibn Ezra (1070–1138)[d]
 - Ibn Falaquera (1223–1290)[d][e]
 - Solomon Ibn Gabirol (1021–1058)[a][b][c][d][e]
 - Ibn Hazm (994–1069)[d]
 - Ibn Kammuna (1215–1284)[d][e]
 - Ibn Khaldun (1332–1406)[a][b][c][d]
 - Ibn Masarra (883–931)[d]
 - Ibn Miskawayh (940–1030)[a][d]
 - Bahya ibn Paquda (1040–1110)[b][d]
 - Ibn Sabin (1217–1268)[d]
 - Ibn Taymiya (1263–1328)[d]
 - Samuel ibn Tibbon (c. 1165 – 1232)[e]
 - Ibn Tufail (1110–1185)[a][b][d]
 - Joseph ibn Tzaddik (c. 1149)[b][d]
 - Ivan Aleksandrovich Il'in (1883–1954)[a][b][d]
 - Evald Vassilievich Ilyenkov (1924–1979)[d]
 - Immanuel the Roman (c. 1270 – c. 1330)[d]
 - Roman Ingarden (1893–1970)[a][b][c][d][e]
 - William Ralph Inge (1860–1954)[b][d]
 - José Ingenieros (1877–1925)[b]
 - Nae Ionescu (1890–1940)[b]
 - Muhammad Iqbal (1877–1938)[b][c][d]
 - Luce Irigaray (born 1930)[a][b][c][d]
 - Terence Irwin (born 1947)[c]
 - Isocrates (436–338 BC)[a]
 - Isaac of Stella (1105–1177)[b][d]
 - Isaac Israeli (c. 850–950)[b][d][e]
 - Ito Jinsai (1627–1705)[b][d]
 - Vyacheslav Ivanovich Ivanov (1866–1949)[b]
 
J
- Jesus of Nazareth (4 BC – AD 30 or 33)
 - Frank Jackson (born 1943)[c]
 - Friedrich Heinrich Jacobi (1743–1819)[a][b][c][d][e]
 - Franz Jakubowski (1912–1970)
 - James of Viterbo (1255–1308)[d][e]
 - Henry James Sr. (1811–1882)[b]
 - William James (1842–1910)[a][b][c][d][e]
 - Fredric Jameson (born 1934)
 - Vladimir Jankélévitch (1903–1985)[b]
 - Karl Jaspers (1883–1969)[a][b][c][d][e]
 - Jayarāśi Bhaṭṭa (fl. c. 800)[e]
 - James Hopwood Jeans (1877–1946)[b]
 - Thomas Jefferson (1743–1826)[b][c][d][e]
 - Richard C. Jeffrey (1926–2002)[c]
 - William Stanley Jevons (1835–1882)[a][b][c][e]
 - Rudolf von Jhering (1818–1892)[d]
 - Jinul (or Chinul) (1158–1210)[b][d]
 - Joachim of Fiore (1135–1201)[a][b][d]
 - Friedrich Jodl (1849–1914)[b]
 - John of Damascus (c. 676–749)[a][b][d]
 - John of Jandun (1280–1328)[b][d]
 - John of La Rochelle (1190–1245)[b][d]
 - John of Mirecourt (c. 1345)[b][d]
 - John of Paris (1260–1306)[b][d]
 - John of Salisbury (c. 1115–1180)[a][b][d][e]
 - John of St. Thomas (or Jean Poinsot) (1589–1644)[a][b][d]
 - John of the Cross (1542–1591)[b]
 - Alexander Bryan Johnson (1786–1867)[b][d]
 - Samuel Johnson (1649–1703)[d]
 - Samuel Johnson (1696–1772)[b]
 - Samuel Johnson (1709–1784)[b][c][d]
 - William Ernest Johnson (1858–1931)[a][c]
 - Constance Jones (1848–1922)[e]
 - Jørgen Jørgensen (1894–1969)[c]
 - Théodore Simon Jouffroy (1796–1842)[b]
 - Judah ben Moses of Rome (orJudah Romano) (1292–1330)[d]
 - Carl Jung (1875–1961)[a][b][c][d]
 - Ernst Jünger (1895–1998)[b]
 - Joachim Jungius (1587–1657)[b][d]
 - Justinian I (483–565)[d]
 - Al-Juwayni (1028–1085)[d]
 
K
- Franz Kafka (1883–1924)[b]
 - Kaibara Ekiken (1630–1740)[b][d]
 - Kang Youwei (1858–1927)[a]
 - Milan Kangrga (1923–2008)
 - Immanuel Kant (1724–1804)[a][b][c][d][e]
 - Kao Tzu (c. 420 – 350 BC)[a]
 - David Kaplan (born 1933)[b][c]
 - Mordecai Kaplan (1881–1983)[d]
 - Nikolai Ivanovich Kareev (1850–1931)[b]
 - Lev Platonovich Karsavin (1882–1952)[b]
 - Joseph Kaspi (1279–1340) [e]
 - Walter Kaufmann (1921–1980)[b]
 - Karl Kautsky (1854–1938)[b][c][d]
 - Khedrup Gelek Pelzang (1385–1438)[d]
 - Konstantin Kavelin (1818–1885)[b]
 - Bartholomew Keckermann (1571–1609)[d]
 - Hans Kelsen (1881–1973)[b][c][d]
 - Norman Kemp Smith (1872–1958)[d]
 - Anthony Kenny (born 1931)[c]
 - Johannes Kepler (1571–1630)[a][b][d][e]
 - John Maynard Keynes (1883–1946)[a][b][c][d]
 - Hermann Graf Keyserling (1880–1946)[b]
 - Aleksey Khomyakov (1804–1860)[b]
 - Søren Kierkegaard (1813–1855)[a][b][c][d][e]
 - Richard Kilvington (1302–1361)[a][b][d][e]
 - Robert Kilwardby (1215–1279)[a][b][d][e]
 - Jaegwon Kim (1934–2019)[a][b][c]
 - Al-Kindi (801–873)[a][b][c][d][e]
 - Martin Luther King Jr. (1929–1968)[b]
 - Athanasius Kircher (1602–1680)
 - Ivan Kireevsky (1806–1856)[b]
 - Patricia Kitcher (born 1948)[b]
 - Ludwig Klages (1872–1956)[b]
 - Heinrich von Kleist (1777–1811)[a][b]
 - William Calvert Kneale (1906–1990)[c]
 - Martin Knutzen (1713–1751)[b][d]
 - Ko Hung (4th century)[a]
 - Kurt Koffka (1886–1941)[b]
 - Wolfgang Köhler (1887–1967)[a][b]
 - Alexandre Kojève (1902–1968)[d]
 - Leszek Kołakowski (1927–2009)
 - Alejandro Korn (1860–1936)[b][c]
 - Karl Korsch (1886–1961)
 - Karel Kosík (1926–2003)
 - Tadeusz Kotarbiński (1886–1981)[a][b][c][d]
 - Alexandre Koyre (1892–1964)[d]
 - Aleksei Aleksandrovich Kozlov (1831–1901)[b]
 - Karl Kraus (1874–1936)[c]
 - Karl Christian Friedrich Krause (1781–1832)[a][b][d]
 - Georg Kreisel (1923–2015)[c]
 - Saul Kripke (born 1940)[a][b][c][d]
 - Jiddu Krishnamurti (1895–1986)
 - Uppaluri Gopala Krishnamurti (1918–2007)
 - Julia Kristeva (born 1941)[a][b][c][d]
 - Nachman Krochmal (1785–1840)[d]
 - Leopold Kronecker (1823–1891)[d]
 - Peter Kropotkin (1842–1921)[a][b][c][d]
 - Felix Krueger (1874–1948)[b]
 - Thomas Samuel Kuhn (1922–1996)[a][b][c][d][e]
 - Kūkai (774–835)[c][d][e]
 - Kuki Shūzō (1888–1941)[d]
 - Oswald Külpe (1862–1915)[b]
 - Kumārila Bhaṭṭa (fl. roughly 700)[e]
 - Kumazawa Banzan (1619–1691)[b][d]
 - Kuo Hsiang (or Guoxiang) (died c. 312)[a]
 
L
- Ernst Laas (1837–1885)[b]
 - Lucien Laberthonnière (1860–1932)[b]
 - Lauren Ross (2009–present)[a][b][d]
 - Jean de La Bruyère (1645–1696)[b]
 - Jacques Lacan (1901–1981)[a][b][c][e]
 - Jules Lachelier (1832–1918)[b][d]
 - Ernesto Laclau (1935–2014)
 - Philippe Lacoue-Labarthe (1940–2007)[d]
 - Pierre Laffitte (1823–1903)[a]
 - Louis de La Forge (1632–1666)[a][d][e]
 - Imre Lakatos (1922–1974)[b][c][d][e]
 - André Lalande (1867–1964)[b]
 - Jean-Baptiste Lamarck (1744–1829)[b][c]
 - Johann Heinrich Lambert (1728–1777)[a][b][d]
 - Hughes Felicité Robert de Lamennais (1752–1854)[b]
 - Julien Offray de La Mettrie (1709–1751)[a][b][c][d]
 - François de La Mothe Le Vayer (1588–1672)[b]
 - Ludwig Landgrebe (1902–1992)[b]
 - Friedrich Albert Lange (1828–1875)[a][b][d][e]
 - Susanne Langer (1895–1985)[b][c][d]
 - Lao Zi (or Lao Tzu) (4th century BC)[a][b][c][e]
 - Isaac La Peyrère (1596–1676)[a][b]
 - Pierre-Simon Laplace (1749–1827)[a][b][c]
 - Ivan Ivanovich Lapshin (1870–1952)[b]
 - François de La Rochefoucauld (1613–1680)[b]
 - Pierre Laromiguière (1756–1837)[b]
 - Abdullah Laroui (born 1935)[b]
 - Ferdinand Lassalle (1825–1864)[b][d]
 - Bruno Latour (born 1947)
 - Johann Kaspar Lavater (1741–1801)[b]
 - Louis Lavelle (1883–1951)[b]
 - Antoine Lavoisier (1743–1794)[b]
 - Peter Lavrovitch Lavrov (1823–1900)[b][d]
 - William Law (1686–1761)[b][d]
 - Jean Le Clerc (1657–1737)[b][d]
 - Michèle Le Dœuff (born 1948)[c][d]
 - Henri Lefebvre (1901–1991)[d]
 - Jacques Lefèvre d'Étaples (c. 1455–c. 1536)[e]
 - Claude Lefort (1924–2010)
 - Antoine Le Grand (1629–1699)[d][e]
 - Keith Lehrer (born 1936)[b][c]
 - Gottfried Leibniz (1646–1716)[a][b][c][d][e]
 - Yeshayahu Leibowitz (1903–1994)[d][e]
 - Vladimir Lenin (1870–1924)[a][b][c][d]
 - Leonardo da Vinci (1452–1519)[b]
 - Konstantin Nikolaevich Leont'ev (1831–1891)[b][d]
 - Aleksei N. Leontiev (1903–1979)
 - Giacomo Leopardi (1798–1837)[b]
 - Jules Lequier (1814–1862)[a][b]
 - Pierre Leroux (1798–1871)[a]
 - Edouard Louis Emmanuel Julien Le Roy (1870–1954)[b][d]
 - René Le Senne (1882–1954)[b]
 - Stanisław Leśniewski (1886–1939)[a][b][c][d][e]
 - Gotthold Ephraim Lessing (1729–1781)[a][b][c][d]
 - Leucippus (5th century BC)[a][b][c][d][e]
 - Emmanuel Levinas (1906–1995)[a][b][c][d][e]
 - Claude Lévi-Strauss (1908–2009)[c][d]
 - Lucien Lévy-Bruhl (1857–1939)[b][c]
 - Kurt Lewin (1890–1947)[a]
 - Clarence Irving Lewis (1883–1964)[a][b][c][d][e]
 - C. S. Lewis (1898–1963)[a][b][d]
 - David Kellogg Lewis (1941–2001)[a][b][c][d][e]
 - Li Ao (722–841)[a][b]
 - Liang Qichao (or Liang Ch'i-ch'ao) (1873–1929)[a]
 - Liang Sou-ming (1893–1988)[a]
 - Georg Christoph Lichtenberg (1742–1799)[b][c][d]
 - Arthur Liebert (1878–1946)[b]
 - Otto Liebmann (1840–1912)[b]
 - Liezi (or Lieh Tzu) (c. 440 – c. 360& BC)[a]
 - Mikhail Lifshitz (1905–1983)
 - Linji Yixuan (or Lin Chi) (c. 810 – 867)[d]
 - Carl Linnaeus (1707–1778)[d]
 - Theodor Lipps (1851–1914)[b]
 - Justus Lipsius (1547–1606)[b][d][e]
 - Émile Littré (1801–1881)[b]
 - Liu Shaoqi (orLiu Shao-ch'i) (1898–1969)[a]
 - Liu Tsung-chou (or Ch'i-shan) (1578–1645)[a]
 - Genevieve Lloyd (born 1941)[b]
 - Karl Nickerson Llywelyn (1893–1962)[d]
 - Ramon Llull (1235–1315)[a][b][d][e]
 - Alain LeRoy Locke (1885–1954)[e]
 - John Locke (1632–1704)[a][b][c][d][e]
 - Alfred Loisy (1857–1940)[b][d]
 - Peter Lombard (c. 1100 – 1160)[a][b][d]
 - Bernard Lonergan (1904–1984)[d]
 - Pseudo-Longinus (1st century)[a][b]
 - Leo Mikhailovich Lopatin (1855–1920)[b]
 - Paul Lorenzen (1915–1995)[d]
 - Aleksei Fedorovich Losev (1893–1988)[b][d]
 - Nicholas Onufrievich Lossky (1870–1965)[b][d]
 - Domenico Losurdo (1941–2018)
 - Juri Lotman (1922–1993)[b]
 - Hermann Lotze (1817–1881)[a][b][c][d][e]
 - Arthur O. Lovejoy (1873–1962)[b][c]
 - Leo Löwenthal (1900–1993)
 - Michael Löwy (born 1938)
 - John R. Lucas (1929–2020)[c]
 - Lucian (c. 120 – c. 180)[b][d]
 - Lucretius (c. 99 – 55 BC)[a][b][c][d][e]
 - Lu Jiuyuan (or Lu Xiangshan, or Lu Chiu-yuan, or Tzu-ching, or Ts'un-chai) (1139–1193)[a][b][d]
 - Georg Lukács (1885–1971)[a][b][c][d][e]
 - Jan Łukasiewicz (1878–1956)[a][b][c][d][e]
 - Anatoliy Lunacharskiy (1875–1933)[b]
 - Martin Luther (1483–1546)[a][b][c][d][e]
 - Rosa Luxemburg (1871–1919)[d]
 - William Lycan (born 1945)[c]
 - Jean-François Lyotard (1924–1998)[a][b][c][d][e]
 
M
- Catharine Macaulay (1731–1791)[e]
 - Ernst Mach (1838–1916)[a][b][c][d][e]
 - Niccolò Machiavelli (1469–1527)[a][b][c][d][e]
 - Alasdair MacIntyre (born 1929)[a][b][c][d]
 - John Leslie Mackie (1917–1981)[b][c]
 - Madhava (died 1386)[d]
 - Shri Madhvacharya (1238–1317)[a][c][d]
 - Mahavira (599–527 BC)[a][d]
 - Salomon Maimon (or Salomon ben Joshua) (1753–1800)[a][b][d][e]
 - Abraham ben Moses Maimonides (or Abraham ben Maimon) (1186–1237)[d]
 - Maimonides (or Rambam) (1135–1204)[a][b][c][d][e]
 - Maine de Biran (1766–1824)[b][c][d]
 - John Major (or John Mair) (1467–1550)[b][c][d]
 - Errico Malatesta (1853–1932)
 - Norman Malcolm (1911–1990)[a][b][c]
 - Nicolas Malebranche (1638–1715)[a][b][c][d][e]
 - Ernst Mally (1879–1944)[e]
 - André Malraux (1901–1976)[b]
 - Thomas Malthus (1766–1834)[b]
 - Merab Mamardashvili (1930–1990)[b][d]
 - Bernard de Mandeville (1670–1733)[b][d]
 - Mani (3rd century)[b]
 - Karl Mannheim (1893–1947)[a][b][c]
 - Henry Longueville Mansel (1820–1871)[a][b]
 - Mao Zedong (or Mao Tse-tung) (1893–1976)[a]
 - Gabriel Marcel (1887–1973)[a][b][c][d][e]
 - Marcion (110–160)[b]
 - Ruth Barcan Marcus (1921–2012)[a][b][c]
 - Herbert Marcuse (1898–1979)[a][c][d][e]
 - Joseph Maréchal (1878–1944)[b]
 - Juan de Mariana (1536–1624)[a][b]
 - Julián Marías (1914–2005)[b]
 - José Carlos Mariátegui (1894–1930)
 - Lucrezia Marinella (1571–1653)[e]
 - Jacques Maritain (1882–1973)[a][b][c][d][e]
 - Gaius Marius Victorinus (4th century)[d]
 - Mihailo Marković (1923–2010)
 - Svetozar Marković (1846–1875)[b]
 - Odo Marquard (1928–2015)
 - Marsilius of Inghen (1330–1396)[a][b][d][e]
 - Marsilius of Padua (or Marsiglio or Marsilio dei Mainardine) (1270–1342)[a][b][c][d]
 - Roger Marston (1235–1303)[b][d]
 - José Martí (1853–1895)
 - Charles B. Martin (1924–2008)[c]
 - Harriet Martineau (1802–1876)[d]
 - James Martineau (1805–1900)[a][b][c]
 - Piero Martinetti (1872–1943)[b]
 - Anton Marty (1847–1914)[b][e]
 - Marko Marulić (1450–1524)[b]
 - Karl Marx (1818–1883)[a][b][c][d][e]
 - Tomáš Masaryk (1850–1937)[b][c][d]
 - Damaris Cudworth Masham (1659–1708)[a][d][e]
 - Cotton Mather (1663–1728)[b]
 - Matthew of Aquasparta (1238–1302)[b][d]
 - Pierre Louis Maupertuis (1698–1759)[b]
 - Fritz Mauthner (1849–1923)[d]
 - James Clerk Maxwell (1831–1879)[a][b][d]
 - Ernst Mayr (1904–2005)
 - James McCosh (1811–1894)[a][b]
 - William McDougall (1871–1938)[a][b]
 - John McDowell (born 1942)[b][c]
 - Evander Bradley McGilvary (1864–1953)[b]
 - Colin McGinn (born 1950)[c]
 - John Ellis McTaggart (1866–1925)[a][b][c][d][e]
 - George Herbert Mead (1863–1931)[a][b][c][d][e]
 - Bartolomé de Medina (1527–1580)[a]
 - Georg Friedrich Meier (1718–1777)[b]
 - Friedrich Meinecke (1862–1954)[b][d]
 - Alexius Meinong (1853–1920)[a][b][c][d][e]
 - Philipp Melanchthon (1497–1560)[b][d]
 - Melissus of Samos (late 5th century BC)[a][b][c][d]
 - D. Hugh Mellor (1938–2020)[c]
 - Menasseh Ben Israel (1604–1657)[b]
 - Mencius (or Meng K'o or Meng-tzu or Mengzi) (372–289 BC)[a][b][c][d][e]
 - Gregor Mendel (1822–1884)[a]
 - Moses Mendelssohn (1729–1786)[a][b][c][d][e]
 - Susan Mendus (born 1951)
 - Désiré-Joseph Mercier (1851–1926)[a][b]
 - Maurice Merleau-Ponty (1908–1961)[a][b][c][d][e]
 - George merill (1867–1928)
 - Marin Mersenne (1588–1648)[a][b][d][e]
 - Jean Meslier (1664–1729)[b]
 - Judah Messer Leon (c. 1425 – c. 1495)[d]
 - István Mészáros (1930–2017)
 - Emile Meyerson (1859–1933)[b][c][d]
 - Conyers Middleton (1683–1750)[b]
 - Mary Midgley (1919–2018)
 - Nikolai Konstantinovich Mikhailovskii (1842–1904)[b][d]
 - Miki Kiyoshi (1897–1945)[b][d]
 - Mikyo Dorje (or Mi bskyod rdo rje) (1507–1554)[d]
 - Gaston Milhaud (1858–1918)[b]
 - James Mill (1773–1836)[a][b][c][d][e]
 - John Stuart Mill (1806–1873)[a][b][c][d][e]
 - John Millar (1735–1801)[d]
 - Dickinson Miller (1868–1963)[b]
 - Ruth Millikan (born 1933)[b][c]
 - John Milton (1608–1674)[b]
 - Minagawa Kien (1734–1807)[b]
 - Mir Damad (or Mir Mohammad Baqer Esterabadi) (died 1631)[d]
 - Miura Baien (1723–1789)[b]
 - Jacob Moleschott (1822–1893)[b]
 - Luis de Molina (1535–1600)[a][b][c][d]
 - Enrique Molina Garmendia (1871–1962)[b]
 - Lord Monboddo (or James Burnett) (1714–1799)[d]
 - Richard Montague (1930–1971)[b][d]
 - William Pepperell Montague (1873–1953)[b]
 - Michel de Montaigne (1533–1592)[a][b][c][d][e]
 - Baron de Montesquieu (1689–1755)[a][b][d][e]
 - Edmund Montgomery (1835–1911)[b]
 - G. E. Moore (1873–1958)[a][b][c][d][e]
 - Henry More (1614–1687)[a][b][d][e]
 - Thomas More (1478–1535)[a][b][e]
 - C. Lloyd Morgan (1852–1936)[b]
 - Lewis H. Morgan (1818–1881)[b]
 - Thomas Morgan (died 1743)[b]
 - Karl Philipp Moritz (1756–1793)[b]
 - Edgar Morin (born 1921)
 - Gaetano Mosca (1858–1941)[a][b]
 - Motoori Norinaga (1730–1801)[d]
 - Emmanuel Mounier (1905–1950)[b]
 - Mou Tsung-san (1909–1995)[a]
 - Mozi (or Mo Tzu, or Mo Ti, or Micius) (c. 470 – c. 390 BC)[a][b][d]
 - David Ibn Merwan Al-Mukammas (or Daud Ibn Marwan al-Muqammas or David ha-Bavli) (died 937)[b][d]
 - Mulla Sadra (1571–1640)[b][c][d][e]
 - Iris Murdoch (1919–1999)[b][c]
 - Muro Kyuso (1658–1734)[b]
 - Arthur Edward Murphy (1901–1962)[b]
 - Musonius Rufus (1st century)[b][d]
 
N
- Arne Næss (1912–2009)[c][d]
 - Nagarjuna (c. 200 CE)[a][b][c][d][e]
 - Ernest Nagel (1901–1985)[a][b][c][d]
 - Thomas Nagel (born 1937)[a][b][c][d]
 - Nahmanides (1194–1270)[d]
 - Jacques-André Naigeon (1738–1810)[b]
 - Toju Nakae (1608–1648)[b]
 - Jean-Luc Nancy (1940–2021)[d]
 - Hossein Nasr (born 1933)[b]
 - Paul Gerhard Natorp (1854–1924)[b][e]
 - Sergey Nechayev (1847–1882)
 - Alexander Neckham (1157–1217)[d]
 - Antonio Negri (born 1933)
 - Leonard Nelson (1882–1927)[b]
 - Nemesius of Emesa (fl. c. 400)[a][b][d]
 - John von Neumann (1903–1957)[a][b][c][d]
 - Otto Neurath (1882–1945)[b][c][d][e]
 - John Henry Newman (1801–1890)[a][b][d]
 - Isaac Newton (1642–1727)[a][b][c][d][e]
 - Nichiren (1222–1282)[d]
 - Nicholas of Autrecourt (c. 1300 – 1369)[a][b][c][d][e]
 - Nicholas of Cusa (1401–1464)[a][b][c][d][e]
 - Christoph Friedrich Nicolai (1733–1811)[b]
 - Pierre Nicole (1625–1695)[b]
 - H. Richard Niebuhr (1894–1962)[d]
 - Reinhold Niebuhr (1892–1971)[b][d]
 - Friedrich Nietzsche (1844–1900)[a][b][c][d][e]
 - Agostino Nifo (1470–1538)[d]
 - Nishi Amane (1829–1897)[b][d]
 - Nishida Kitaro (1870–1945)[b][c][d][e]
 - Nishitani Keiji (1900–1990)[c][d]
 - Kwame Nkrumah (1909–1972)[c]
 - John Norris (1657–1711)[b][d][e]
 - Novalis (1772–1801)[a][b][e]
 - Robert Nozick (1938–2001)[a][b][c][d]
 - Numenius of Apamea (2nd century)[a][b][d][e]
 - Martha Nussbaum (born 1947)[a][b][c]
 - Anders Nygren (1890–1978)[d]
 
O
- Michael Oakeshott (1901–1990)[a][b][c][d][e]
 - William of Ockham (c. 1285–1349)[a][b][c][d][e]
 - Ogyū Sorai (1666–1728)[b][d]
 - Lorenz Oken (1779–1851)[b][d]
 - Karl Olivecrona (1897–1980)[d]
 - Peter Olivi (1248–1298)[a][b][d][e]
 - Olympiodorus the Younger (495–570)[e]
 - John Wood Oman (1860–1939)[b][d]
 - Michel Onfray (born 1959)
 - Onora O'Neill (born 1941)[c]
 - Nicole Oresme (1320–1382)[b][d][e]
 - Origen of Alexandria (c. 182–c. 251)[a][b][d][e]
 - Isaac Orobio de Castro (1617–1687)[b]
 - Hans Christian Ørsted (1777–1851)
 - José Ortega y Gasset (1883–1955)[a][b][c][d][e]
 - Wilhelm Ostwald (1853–1932)[b]
 - James Oswald (1703–1793)[d]
 - Rudolf Otto (1869–1937)[b][d]
 - Richard Overton (died c. 1665)[d]
 - Gwilyn Ellis Lane Owen (1922–1982)[b][c][d]
 
P
- Thomas Paine (1737–1809)[a][b][c][d][e]
 - Menyhért Palágyi (1859–1924)[b]
 - William Paley (1743–1805)[a][b][d]
 - Elihu Palmer (1764–1806)[b]
 - Panaetius (c. 185 – c. 110 BC)[b][d]
 - Antonie Pannekoek (1873–1960)
 - Wolfhart Pannenberg (1928–2014)[b]
 - David Papineau (born 1947)[c]
 - Giovanni Papini (1881–1956)[b]
 - Paracelsus (1493–1541)[a][b][d]
 - Vilfredo Pareto (1848–1923)[b]
 - Derek Parfit (1942–2017)[a][b][c]
 - Theodore Parker (1810–1860)[b]
 - Parmenides (5th century BC)[a][b][c][d][e]
 - Blaise Pascal (1623–1662)[a][b][d][e]
 - John Arthur Passmore (1914–2004)[d]
 - Valentino Annibale Pastore (1868–1956)[b]
 - Patañjali (2nd century BC)[d]
 - Walter Pater (1839–1904)[b]
 - Jan Patočka (1907–1977)[d]
 - Francesco Patrizi da Cherso (or Franciscus Patritius) (1529–1597)[b][d][e]
 - Akos Pauler (1876–1933)[b]
 - Linus Pauling (1901–1994)[b]
 - Paul of Venice (1369–1429)[a][b][d][e]
 - Friedrich Paulsen (1846–1908)[b]
 - Ivan Pavlov (1849–1936)[b]
 - Christopher Peacocke (born 1950)[c]
 - Giuseppe Peano (1858–1932)[b][c]
 - David Pears (1921–2009)[c]
 - Karl Pearson (1857–1936)[b]
 - John Peckham (died 1292)[b][d]
 - Benjamin Peirce (1809–1880)[e]
 - Charles Sanders Peirce (1839–1914)[a][b][c][d][e]
 - Pelagius (c. 360 – c. 435)[b][c]
 - William Penbygull (died 1420)[e]
 - Thomas Percival (1740–1804)[a]
 - Ralph Barton Perry (1876–1957)[a][b][c]
 - Johann Heinrich Pestalozzi (1746–1827)[b]
 - Peter of Auvergne (13th century)[d]
 - Peter of Spain (13th century; usually identified with Pope John XXI)[a][b][c][d][e]
 - Richard Stanley Peters (1919–2011)[c]
 - Petrarch (1304–1374)[b][c][d]
 - Leon Petrazycki (1867–1931)[d]
 - Joane Petrizi (12th century)[e]
 - Branislav Petronijević (1875–1954)[b]
 - Petar II Petrović-Njegoš (1813–1851)[b]
 - Joseph Petzoldt (1862–1929)[b]
 - Alexander Pfänder (1870–1941)[b]
 - Philip the Chancellor (1160–1236)[d][e]
 - Philo Judaeus of Alexandria (20 BC–40 AD)[a][b][c][d][e]
 - Philo of Larissa (1st century BC)[d][e]
 - Philo the Dialectician (c. 300 BC)[c][d]
 - Philodemus of Gadara (1st century BC)[b][d][e]
 - Philolaus of Croton (c. 480 – c. 405 BC)[a][b][d][e]
 - Philo of Larissa (154 – 84 BC)[b]
 - Philo of Megara (300 BC c.)[b]
 - John Philoponus (early 6th century)[a][b][c][d][e]
 - Jean Piaget (1896–1980)[a][b][d]
 - Giovanni Pico della Mirandola (1463–1494)[a][b][c][d][e]
 - Dimitri Pisarev (1840–1868)[b]
 - Max Planck (1858–1947)[b][c][d]
 - Alvin Plantinga (born 1932)[a][b][c]
 - Plato (c. 427 – c. 347 BC)[a][b][c][d][e]
 - Georgi Plekhanov (1856–1918)[a][b][c][d]
 - Helmuth Plessner (1892–1985)[b]
 - Gemistus Pletho (c. 1355 – c. 1452)[b]
 - Plotinus (died 270)[a][b][c][d][e]
 - Gottfried Ploucquet (1716–1790)[b]
 - Mestrius Plutarch of Chaeronia (c. 45 – c. 120)[b][d][e]
 - Henri Poincaré (1854–1912)[a][b][c][d][e]
 - Karl Polanyi (1886–1964)
 - Michael Polanyi (1891–1976)[d]
 - Pietro Pomponazzi (1462–1525)[a][b][c][d][e]
 - Alexander Pope (1688–1744)[b]
 - Karl Popper (1902–1994)[a][b][c][d][e]
 - Josef Popper-Lynkeus (1838–1921)[b]
 - Porphyry (c. 232 – c. 304)[a][b][c][d][e]
 - Giambattista della Porta (c. 1535–1615)[e]
 - Noah Porter (1811–1892)[b]
 - Posidonius (c. 135 – 51 BC)[b][d]
 - Richard Posner (born 1939)[b]
 - Emil Leon Post (1897–1954)[d]
 - Robert Joseph Pothier (1699–1772)[d]
 - Nicos Poulantzas (1936–1979)
 - François Poullain de la Barre (1647–1723)[e]
 - Roscoe Pound (1870–1964)[d]
 - Caio Prado Júnior (1907–1990)
 - Costanzo Preve (1943–2013)
 - Henry Habberley Price (1899–1984)[c]
 - Richard Price (1723–1791)[a][b][c][d][e]
 - Harold Arthur Prichard (1871–1947)[a][c][d][e]
 - Joseph Priestley (1733–1804)[a][b][c][d]
 - Andrew Seth Pringle-Pattison (1856–1931)[b]
 - Arthur Prior (1914–1969)[b][d][e]
 - Proclus (412–487)[b][c][d][e]
 - Prodicus (c. 450 – 399 BC)[b][d]
 - Protagoras (c. 481 – 420 BC)[b][c][d][e]
 - Pierre-Joseph Proudhon (1809–1865)[a][b][c][d]
 - Marcel Proust (1871–1922)[b]
 - Pseudo-Dionysius the Areopagite (5th century)[b][d][e]
 - Pseudo-Grosseteste (13th century)[b][d]
 - Ptolemy (c. 85 – c. 165)[d]
 - Samuel Pufendorf (1632–1694)[a][b][d]
 - Isaac ben Joseph ibn Pulgar (14th century)[e]
 - Hilary Putnam (1926–2016)[a][b][c][d]
 - Pyrrho (c. 360 – c. 270)[a][b][c][d][e]
 - Pythagoras (582 – 496 BC)[a][b][c][d][e]
 
Q
- Antero de Quental (1842–1891)
 - Ismael Quiles (1906–1993)
 - W. V. O. Quine (1908–2000)[a][b][c][d][e]
 - Anthony Quinton (1925–2010)[c]
 
References
- The Cambridge Dictionary of Philosophy, (Second Edition). Cambridge University Press; 1999. ISBN 0-521-63722-8
 - Stanford Encyclopedia of Philosophy. Biographies covered as of October 2, 2020
 
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