- Apr 1 Božidar Kunc, Croatian concert pianist and composer, dies of a heart attack backstage after a performance with the Detroit Symphony at 60
Douglas MacArthur (1880-1964)
Apr 5 American US Army General in World War II (Pacific Theater; Philippines) and Korea, dies at 84
- Apr 9 Hesketh Pearson, English biographer and playwright (Writ for Libel), dies at 77
- Apr 12 Evert Willem Beth, Dutch mathematician and philosopher (Significs Group), dies at 56
- Apr 14 Earle Hodgins, American fast-talking film and television character actor (Guestward Ho!), dies at 70
- Apr 14 Herb McGirr, New Zealand cricket all-rounder (played in NZ's 1st Test series; 2 Tests, 1 x 50; Wellington), dies at 72
Rachel Carson (1907-1964)
Apr 14 American marine biologist, conservationist and author (Silent Spring), dies of a heart attack at 56
- Apr 14 Tatyana Afanasyeva, Russian-Dutch mathematician and physicist (fields of statistical mechanics and statistical thermodynamics), dies at 87
- Apr 18 Albe Vidaković, Croatian composer, dies at 49
- Apr 18 Ben Hecht, American novelist, screenwriter and playwright (The Front Page), dies at 71
- Apr 19 Cyril Merry, Trinidadian cricketer (WI batsman in 2 Tests 1933), dies at 53
- Apr 20 Eddie Dyer, American baseball player, dies at 64
Karl Polanyi (1886-1964)
Apr 23 Austro-Hungarian economic anthropologist (The Great Transformation), dies at 77
- Apr 24 Gerhard Domagk, German bacteriologist (Nobel Prize 1939 in Physiology or Medicine - first commercially available antibiotic and marketed under the brand name Prontosil), dies at 68
- Apr 26 Edwin John Pratt, Canadian poet (Towards the Last Spike), dies at 81
- Apr 26 Pieter van der Lijn, Dutch geologist (Boulder Book), dies at 93
- Apr 27 Georg Britting, German poet, dies at 73
- Apr 28 Rolf de Maré, Swedish art collector & museum director, dies at 75
- Apr 29 Albert Saverys, Flemish painter, dies at 77
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide