- Apr 3 Benny "Kid" Paret, American welterweight boxer, dies after a fight at 24
- Apr 3 Manolis Kalomiris, Greek opera composer, dies at 78
- Apr 4 James Hanratty, executed at Bedford Prison, England, for the murder of Michael Gregsten (b. 1936)
- Apr 9 Juan Belmonte, famed bullfighter, dies at 70
- Apr 10 Michael Curtiz, Hungarian-born director (b. 1886)
- Apr 10 Stuart Sutcliffe, Scottish visual artist and rock bassist (The Beatles, 1960-61), dies of a brain hemorrhage at 21
- Apr 12 Antoine Pevsner, Russian-born French sculptor (Constructivist style), dies at 66
- Apr 12 M. Visvesvaraya, Indian civil engineer and statesman (19th Diwan of the Mysore Kingdom), dies at 100
- Apr 12 Ron Flockhart, Scottish auto racer (24 Hours of Le Mans 1956, 57), dies in plane accident at 38
- Apr 13 Culbert Olson, American lawyer and politician (Gov-D-Cal), dies at 85
- Apr 15 Arsenio Lacson, Filipino journalist and politician (Mayor of Manila, 1952-62), dies of a stroke at 49
- Apr 15 Clara Blandick [Clara Blanchard Dickey], American stage and screen character actress (Tom Sawyer; Huckleberry Finn; Wizard of Oz), commits suicide at 85
- Apr 15 Esther Minciotti, Italian actress, dies at 73
- Apr 17 Louise Fazenda, American vaudeville, and silent and sound screen actress (Mack Sennett comedies), dies of cerebral hemorrhage at 66
- Apr 20 Artúr Harmat, Hungarian composer, dies at 76
- Apr 20 Jesse G. Vincent, American engineer (designed 1st V-12 engine, Packard automobiles) dies at 82
- Apr 21 Frederick Handley Page, designer of 1st big airplane (40 seats), dies
- Apr 22 Solomon Pimsleur, French composer, dies at 61
- Apr 22 Vera Reynolds, American actress (Dragnet Patrol, Lawless Woman), dies at 62
- Apr 27 A. K. Fazlul Huq, Bengali statesman, dies at 88
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide