| 104371 | September 12 | Death | 1836 – Christian Dietrich Grabbe, German playwright (b. 1801) |
| 104372 | September 12 | Death | 1869 – Peter Mark Roget, English physician, theologian, and lexicographer (b. 1779) |
| 104373 | September 12 | Death | 1870 – Fitz Hugh Ludlow, American journalist, explorer, and author (b. 1836) |
| 104374 | September 12 | Death | 1874 – François Guizot, French historian and politician, 22nd Prime Minister of France (b. 1787) |
| 104375 | September 12 | Death | 1885 – Ranbir Singh, Indian tribal chief (b. 1830) |
| 104376 | September 12 | Death | 1903 – Duncan Gillies, Scottish-Australia businessman and politician, 14th Premier of Victoria (b. 1834) |
| 104377 | September 12 | Death | 1907 – Ilia Chavchavadze, Georgian poet, journalist, and lawyer (b. 1837) |
| 104378 | September 12 | Death | 1912 – Pierre-Hector Coullié, French cardinal (b. 1829) |
| 104379 | September 12 | Death | 1918 – George Reid, Australian accountant and politician, 4th Prime Minister of Australia (b. 1845) |
| 104380 | September 12 | Death | 1919 – Leonid Andreyev, Russian author and playwright (b. 1871) |
| 104381 | September 12 | Death | 1923 – Jules Violle, French physicist and academic (b. 1841) |
| 104382 | September 12 | Death | 1927 – Sarah Frances Whiting, American physicist and astronomer (b. 1847) |
| 104383 | September 12 | Death | 1929 – Rainis, Latvian poet and playwright (b. 1865) |
| 104384 | September 12 | Death | 1938 – Prince Arthur of Connaught (b. 1883) |
| 104385 | September 12 | Death | 1942 – Valentine Baker, Welsh co-founder of the Martin-Baker Aircraft Company (b. 1888) |
| 104386 | September 12 | Death | 1945 – Hajime Sugiyama, Japanese field marshal and politician, 44th Japanese Minister of War (b. 1880) |
| 104387 | September 12 | Death | 1953 – James Hamilton, 3rd Duke of Abercorn, English politician, Governor of Northern Ireland (b. 1869) |
| 104388 | September 12 | Death | 1953 – Hugo Schmeisser, German engineer (b. 1884) |
| 104389 | September 12 | Death | 1953 – Lewis Stone, American actor (b. 1879) |
| 104390 | September 12 | Death | 1956 – Hans Carossa, German author and poet (b. 1878) |
| 104391 | September 12 | Death | 1956 – Noëlle, Countess of Rothes (b. 1878) |
| 104392 | September 12 | Death | 1956 – Sándor Festetics, Hungarian politician, Hungarian Minister of War (b. 1882) |
| 104393 | September 12 | Death | 1960 – Dino Borgioli, Italian tenor and actor (b. 1891) |
| 104394 | September 12 | Death | 1961 – Carl Hermann, German physicist and academic (b. 1898) |
| 104395 | September 12 | Death | 1962 – Spot Poles, American baseball player and soldier (b. 1887) |
| 104396 | September 12 | Death | 1962 – Rangeya Raghav, Indian author and playwright (b. 1923) |
| 104397 | September 12 | Death | 1967 – Vladimir Bartol, Italian-Slovene author and playwright (b. 1903) |
| 104398 | September 12 | Death | 1968 – Tommy Armour, Scottish-American golfer and journalist (b. 1894) |
| 104399 | September 12 | Death | 1971 – Walter Egan, American golfer (b. 1881) |
| 104400 | September 12 | Death | 1972 – William Boyd, American actor and producer (b. 1895) |