| 30481 | March 18 | Death | 1835 – Christian Günther von Bernstorff, Danish-Prussian politician and diplomat (b. 1769) |
| 30482 | March 18 | Death | 1845 – Johnny Appleseed, American environmentalist (b. 1774) |
| 30483 | March 18 | Death | 1871 – Augustus De Morgan, Indian-English mathematician and academic (b. 1806) |
| 30484 | March 18 | Death | 1898 – Matilda Joslyn Gage, American author and activist (b. 1826) |
| 30485 | March 18 | Death | 1907 – Marcellin Berthelot, French chemist and politician, French Minister of Foreign Affairs (b. 1827) |
| 30486 | March 18 | Death | 1913 – George I of Greece (b. 1845) |
| 30487 | March 18 | Death | 1918 – Henry Janeway Hardenbergh, American architect, designed the Plaza Hotel (b. 1847) |
| 30488 | March 18 | Death | 1933 – Prince Luigi Amedeo, Duke of the Abruzzi (b. 1873) |
| 30489 | March 18 | Death | 1936 – Eleftherios Venizelos, Greek journalist, lawyer, and politician, 93rd Prime Minister of Greece (b. 1864) |
| 30490 | March 18 | Death | 1939 – Henry Simpson Lunn, English businessman, founded Lunn Poly (b. 1859) |
| 30491 | March 18 | Death | 1941 – Henri Cornet, French cyclist (b. 1884) |
| 30492 | March 18 | Death | 1947 – William C. Durant, American businessman, co-founded General Motors and Chevrolet (b. 1861) |
| 30493 | March 18 | Death | 1954 – Walter Mead, English cricketer (b. 1868) |
| 30494 | March 18 | Death | 1956 – Louis Bromfield, American environmentalist and author (b. 1896) |
| 30495 | March 18 | Death | 1962 – Walter W. Bacon, American accountant and politician, 60th Governor of Delaware (b. 1880) |
| 30496 | March 18 | Death | 1963 – Wanda Hawley, American actress and singer (b. 1895) |
| 30497 | March 18 | Death | 1964 – Sigfrid Edström, Swedish businessman, 4th President of the International Olympic Committee (b. 1870) |
| 30498 | March 18 | Death | 1965 – Farouk of Egypt (b. 1920) |
| 30499 | March 18 | Death | 1965 – Jack Quinlan, American sportscaster (b. 1927) |
| 30500 | March 18 | Death | 1969 – Barbara Bates, American actress and singer (b. 1925) |
| 30501 | March 18 | Death | 1973 – Johannes Aavik, Estonian philologist and poet (b. 1880) |
| 30502 | March 18 | Death | 1975 – Alain Grandbois, Canadian poet and educator (b. 1900) |
| 30503 | March 18 | Death | 1976 – Giuseppe Genco Russo, Italian mob boss (b. 1893) |
| 30504 | March 18 | Death | 1977 – Marien Ngouabi, Congolese politician, President of the Republic of the Congo (b. 1938) |
| 30505 | March 18 | Death | 1977 – Carlos Pace, Brazilian race car driver (b. 1944) |
| 30506 | March 18 | Death | 1978 – Leigh Brackett, American author and screenwriter (b. 1915) |
| 30507 | March 18 | Death | 1978 – Peggy Wood, American actress and singer (b. 1892) |
| 30508 | March 18 | Death | 1980 – Erich Fromm, German psychologist and philosopher (b. 1900) |
| 30509 | March 18 | Death | 1981 – Cahide Sonku, Turkish actress, director, and producer (b. 1916) |
| 30510 | March 18 | Death | 1982 – Patrick Smith, Irish farmer and politician, Minister for Agriculture, Food and the Marine (b. 1901) |