| 42301 | April 12 | Death | 1782 – Metastasio, Italian-Austrian poet and composer (b. 1698) |
| 42302 | April 12 | Death | 1788 – Carlo Antonio Campioni, French-Italian composer (b. 1719) |
| 42303 | April 12 | Death | 1795 – Johann Kaspar Basselet von La Rosée, Bavarian general (b. 1710) |
| 42304 | April 12 | Death | 1814 – Charles Burney, English composer and historian (b. 1726) |
| 42305 | April 12 | Death | 1817 – Charles Messier, French astronomer and academic (b. 1730) |
| 42306 | April 12 | Death | 1850 – Adoniram Judson, American lexicographer and missionary (b. 1788) |
| 42307 | April 12 | Death | 1866 – Peter Hesketh-Fleetwood, English politician, founded Fleetwood (b. 1801) |
| 42308 | April 12 | Death | 1872 – Nikolaos Mantzaros, Greek composer and theorist (b. 1795) |
| 42309 | April 12 | Death | 1878 – William M. Tweed, American lawyer and politician (b. 1823) |
| 42310 | April 12 | Death | 1898 – Elzéar-Alexandre Taschereau, Canadian cardinal (b. 1820) |
| 42311 | April 12 | Death | 1902 – Marie Alfred Cornu, French physicist and academic (b. 1842) |
| 42312 | April 12 | Death | 1906 – Mahesh Chandra Nyayratna Bhattacharyya, Indian scholar, academic, and philanthropist (b. 1836) |
| 42313 | April 12 | Death | 1912 – Clara Barton, American nurse and humanitarian, founded the American Red Cross (b. 1821) |
| 42314 | April 12 | Death | 1933 – Adelbert Ames, American general and politician, 30th Governor of Mississippi (b. 1835) |
| 42315 | April 12 | Death | 1937 – Abdülhak Hâmid Tarhan, Turkish playwright and poet (b. 1852) |
| 42316 | April 12 | Death | 1938 – Feodor Chaliapin, Russian opera singer (b. 1873) |
| 42317 | April 12 | Death | 1943 – Viktor Puskar, Estonian colonel (b. 1889) |
| 42318 | April 12 | Death | 1945 – Franklin D. Roosevelt, American lawyer and politician, 32nd President of the United States (b. 1882) |
| 42319 | April 12 | Death | 1953 – Lionel Logue, Australian actor and therapist (b. 1880) |
| 42320 | April 12 | Death | 1962 – Ron Flockhart, Scottish race car driver (b. 1923) |
| 42321 | April 12 | Death | 1966 – Sydney Allard, English racing driver and founder of the Allard car company (b. 1910) |
| 42322 | April 12 | Death | 1968 – Heinrich Nordhoff, German engineer (b. 1899) |
| 42323 | April 12 | Death | 1971 – Wynton Kelly, American pianist and composer (b. 1931) |
| 42324 | April 12 | Death | 1971 – Ed Lafitte, American baseball player and dentist (b. 1886) |
| 42325 | April 12 | Death | 1973 – Arthur Freed, American songwriter and producer (b. 1894) |
| 42326 | April 12 | Death | 1975 – Josephine Baker, American-French actress, singer, and dancer (b. 1906) |
| 42327 | April 12 | Death | 1977 – Philip K. Wrigley, American businessman, co-founded Lincoln Park Gun Club (b. 1894) |
| 42328 | April 12 | Death | 1980 – Clark McConachy, New Zealand snooker player (b. 1895) |
| 42329 | April 12 | Death | 1980 – William R. Tolbert, Jr., Liberian politician, 20th President of Liberia (b. 1913) |
| 42330 | April 12 | Death | 1981 – Prince Yasuhiko Asaka of Japan (b. 1887) |