| 137851 | December 6 | Birth | 846 – Hasan al-Askari, Saudi Arabian 11th of the Twelve Imams (d. 874) |
| 137852 | December 6 | Birth | 1285 – Ferdinand IV of Castile (d. 1312) |
| 137853 | December 6 | Birth | 1421 – Henry VI of England (d. 1471) |
| 137854 | December 6 | Birth | 1478 – Baldassare Castiglione, Italian courtier, diplomat, and author (d. 1529) |
| 137855 | December 6 | Birth | 1586 – Niccolò Zucchi, Italian astronomer and physicist (d. 1670) |
| 137856 | December 6 | Birth | 1608 – George Monck, 1st Duke of Albemarle, English general and politician, Lord Lieutenant of Ireland (d. 1670) |
| 137857 | December 6 | Birth | 1637 – Edmund Andros, English courtier and politician, 4th Colonial Governor of New York (d. 1714) |
| 137858 | December 6 | Birth | 1640 – Claude Fleury, French historian and author (d. 1723) |
| 137859 | December 6 | Birth | 1642 – Johann Christoph Bach, German organist and composer (d. 1703) |
| 137860 | December 6 | Birth | 1685 – Marie Adélaïde of Savoy (d. 1712) |
| 137861 | December 6 | Birth | 1721 – James Elphinston, Scottish philologist and educator (d. 1809) |
| 137862 | December 6 | Birth | 1721 – Guillaume-Chrétien de Lamoignon de Malesherbes, French minister and politician (d. 1794) |
| 137863 | December 6 | Birth | 1752 – Gabriel Duvall, American jurist and politician (d. 1844) |
| 137864 | December 6 | Birth | 1778 – Joseph Louis Gay-Lussac, French physicist and chemist (d. 1850) |
| 137865 | December 6 | Birth | 1792 – William II of the Netherlands (d. 1849) |
| 137866 | December 6 | Birth | 1803 – Maria Josepha Amalia of Saxony (d. 1829) |
| 137867 | December 6 | Birth | 1805 – Adolf Reubke, German organ builder (d. 1875) |
| 137868 | December 6 | Birth | 1805 – Jean Eugène Robert-Houdin, French magician (d. 1861) |
| 137869 | December 6 | Birth | 1812 – Robert Spear Hudson, English businessman and philanthropist (d. 1884) |
| 137870 | December 6 | Birth | 1823 – Max Müller, German-English philologist and orientalist (d. 1900) |
| 137871 | December 6 | Birth | 1833 – John S. Mosby, American colonel (d. 1916) |
| 137872 | December 6 | Birth | 1841 – Frédéric Bazille, French painter and soldier (d. 1870) |
| 137873 | December 6 | Birth | 1849 – August von Mackensen, German field marshal (d. 1945) |
| 137874 | December 6 | Birth | 1853 – Haraprasad Shastri, Indian historian and scholar (d. 1931) |
| 137875 | December 6 | Birth | 1856 – Hans Molisch, Czech-Austrian botanist (d. 1937) |
| 137876 | December 6 | Birth | 1863 – Charles Martin Hall, American chemist and engineer (d. 1914) |
| 137877 | December 6 | Birth | 1872 – Arthur Henry Adams, Australian journalist and author (d. 1936) |
| 137878 | December 6 | Birth | 1872 – William S. Hart, American actor, director, producer, and screenwriter (d. 1946) |
| 137879 | December 6 | Birth | 1874 – Lucien Démanet, French gymnast (d. 1979) |
| 137880 | December 6 | Birth | 1875 – Albert Bond Lambert, American golfer and pilot (d. 1946) |