- Apr 1 Leonard Bloomfield, American linguist (Structural Linguistics), born in Chicago, Illinois (d. 1949)
- Apr 4 William Cumming Rose, American biochemist who discovered threonine (an amino acid), born in Greenville, South Carolina (d. 1985)
- Apr 5 Hedwig Kohn, German-Jewish physicist and one of the first female physicists in Germany, born in what is now Wrocław, Poland (d. 1964)
- Apr 8 Walter Connolly, American actor (Good Earth, 5th Avenue Girl), born in Cincinnati, Ohio (d. 1940)
- Apr 10 Bernardo Houssay, Argentine physiologist (Nobel 1947), born in Buenos Aires, Argentina (d. 1971)
- Apr 10 Heinz Tiessen, German composer, born in Königsberg, Germany (d. 1971)
- Apr 12 Harold Lockwood, American actor (Tess of the Storm Country), born in Newark, New Jersey (d. 1918)
- Apr 13 Gordon S. Fahrni, Canadian physician and President of the Canadian Medical Association, born in Gladstone, Manitoba (d. 1995)
- Apr 15 Mike Brady, American golfer (US Open 1911, 19 runner-up; 9 PGA Tour titles), born in Brighton, Massachusetts (d. 1972)
Joe McCarthy (1887-1978)
Apr 21 American Baseball Hall of Fame manager (Chicago Cubs; New York Yankees - World Series 1932, 36–39, 41, 43; Boston Red Sox), born in Philadelphia, Pennsylvania
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