| 142231 | December 17 | Birth | 1991 – Nadech Kugimiya, Thai actor and singer |
| 142232 | December 17 | Birth | 1991 – Atsedu Tsegay, Ethiopian runner |
| 142233 | December 17 | Birth | 1993 – Patricia Kú Flores, Peruvian tennis player |
| 142234 | December 17 | Birth | 1993 – Kiersey Clemons, American actress |
| 142235 | December 17 | Birth | 1994 – Nat Wolff, American singer-songwriter, keyboard player and actor (Nat & Alex Wolff) |
| 142236 | December 17 | Birth | 1997 – Naiktha Bains, Australian tennis player |
| 142237 | December 17 | Birth | 1998 – Martin Ødegaard, Norwegian footballer |
| 142238 | December 17 | Birth | 2007 – James, Viscount Severn, English son of Prince Edward, Earl of Wessex |
| 142239 | December 17 | Death | 908 – Abdallah ibn al-Mu'tazz, Abbasid prince and poet, anti-caliph for a day (b. 861) |
| 142240 | December 17 | Death | 908 – al-Abbas ibn al-Hasan al-Jarjara'i, Abbasid vizier |
| 142241 | December 17 | Death | 942 – William I of Normandy (b. 900) |
| 142242 | December 17 | Death | 1187 – Pope Gregory VIII (b. 1100) |
| 142243 | December 17 | Death | 1195 – Baldwin V, Count of Hainaut (b. 1150) |
| 142244 | December 17 | Death | 1273 – Rumi, Persian jurist, theologian, and poet (b. 1207) |
| 142245 | December 17 | Death | 1663 – Nzinga of Ndongo and Matamba (b. 1583) |
| 142246 | December 17 | Death | 1721 – Richard Lumley, 1st Earl of Scarbrough, English soldier and politician, Chancellor of the Duchy of Lancaster (b. 1640) |
| 142247 | December 17 | Death | 1830 – Simón Bolívar, Venezuelan general and politician, 2nd President of Venezuela (b. 1783) |
| 142248 | December 17 | Death | 1833 – Kaspar Hauser, German feral child (b. 1812) |
| 142249 | December 17 | Death | 1847 – Marie Louise, Duchess of Parma (b. 1791) |
| 142250 | December 17 | Death | 1860 – Désirée Clary, French wife of Charles XIV John of Sweden (b. 1777) |
| 142251 | December 17 | Death | 1907 – William Thomson, 1st Baron Kelvin, Irish-Scottish physicist and engineer (b. 1824) |
| 142252 | December 17 | Death | 1909 – Leopold II of Belgium (b. 1835) |
| 142253 | December 17 | Death | 1917 – Elizabeth Garrett Anderson, English physician and activist (b. 1836) |
| 142254 | December 17 | Death | 1925 – George Gibb, Scottish businessman (b. 1850) |
| 142255 | December 17 | Death | 1927 – Rajendra Lahiri, Indian activist (b. 1892) |
| 142256 | December 17 | Death | 1928 – Frank Rinehart, American photographer (b. 1861) |
| 142257 | December 17 | Death | 1929 – Manuel de Oliveira Gomes da Costa, Portuguese general and politician, 10th President of Portugal (b. 1863) |
| 142258 | December 17 | Death | 1930 – Peter Warlock, Welsh composer and critic (b. 1894) |
| 142259 | December 17 | Death | 1932 – Charles Winckler, Danish discus thrower, shot putter, and tug of war competitor (b. 1867) |
| 142260 | December 17 | Death | 1933 – 13th Dalai Lama (b. 1876) |