| 145561 | December 26 | Birth | 1994 – Souleymane Coulibaly, Ivorian footballer |
| 145562 | December 26 | Birth | 1995 – Zach Mills, American actor |
| 145563 | December 26 | Birth | 1996 – Airi Matsui, Japanese singer, model, and actress (Sakura Gakuin) |
| 145564 | December 26 | Birth | 1996 – Kasumi Yamaya, Japanese actress and model |
| 145565 | December 26 | Birth | 2000 – Samuel Sevian, American chess player |
| 145566 | December 26 | Birth | 2000 – Isac Elliot, Finnish singer |
| 145567 | December 26 | Death | 268 – Pope Dionysius |
| 145568 | December 26 | Death | 831 – Euthymius of Sardis, Byzantine monk and bishop (b. 754) |
| 145569 | December 26 | Death | 1194 – Aubrey de Vere, 1st Earl of Oxford, English noblemen (b. 1115) |
| 145570 | December 26 | Death | 1350 – Jean de Marigny, French archbishop |
| 145571 | December 26 | Death | 1352 – John, 3rd Earl of Kent, English nobleman (b. 1330) |
| 145572 | December 26 | Death | 1360 – Thomas Holland, 1st Earl of Kent, English nobleman and military commander (b. 1314) |
| 145573 | December 26 | Death | 1458 – Arthur III, Duke of Brittany (b. 1393) |
| 145574 | December 26 | Death | 1476 – Galeazzo Maria Sforza, Italian husband of Bona of Savoy (b. 1444) |
| 145575 | December 26 | Death | 1530 – Babur, Mongolian emperor (b. 1483) |
| 145576 | December 26 | Death | 1574 – Charles, Cardinal of Lorraine (b. 1524) |
| 145577 | December 26 | Death | 1731 – Antoine Houdar de la Motte, French author (b. 1672) |
| 145578 | December 26 | Death | 1771 – Claude Adrien Helvétius, French philosopher and activist (b. 1715) |
| 145579 | December 26 | Death | 1780 – John Fothergill, English physician and botanist (b. 1712) |
| 145580 | December 26 | Death | 1784 – Seth Warner, American colonel (b. 1743) |
| 145581 | December 26 | Death | 1786 – Gasparo Gozzi, Italian playwright and critic (b. 1713) |
| 145582 | December 26 | Death | 1863 – Francis Caulfeild, 2nd Earl of Charlemont (b. 1775) |
| 145583 | December 26 | Death | 1869 – Jean Léonard Marie Poiseuille, French physician and physiologist (b. 1797) |
| 145584 | December 26 | Death | 1890 – Heinrich Schliemann, German-Italian archaeologist and author (b. 1822) |
| 145585 | December 26 | Death | 1909 – Frederic Remington, American painter and illustrator (b. 1861) |
| 145586 | December 26 | Death | 1923 – Dietrich Eckart, German journalist and politician (b. 1868) |
| 145587 | December 26 | Death | 1925 – Jan Letzel, Czech architect, designed the Hiroshima Peace Memorial (b. 1880) |
| 145588 | December 26 | Death | 1929 – Albert Giraud, Belgian poet (b. 1860) |
| 145589 | December 26 | Death | 1931 – Melvil Dewey, American librarian and educator, created the Dewey Decimal Classification (b. 1851) |
| 145590 | December 26 | Death | 1933 – Anatoly Lunacharsky, Russian journalist and politician (b. 1875) |