- Apr 1 Paul Anspach, Belgian fencer (Olympic gold individual epée, team epée 1912), born in Burcht, Belgium (d. 1981)
- Apr 3 Simon Elzinga, Dutch educator
- Apr 4 Mary Howe, American composer (Sand) and pianist, born in Richmond, Virginia (d. 1964)
- Apr 5 Don Blackie, Australian cricketer (Australian off-spinner 1928-29), born in Bendigo, Australia (d. 1955)
- Apr 7 Bert "Dainty" Ironmonger, cricketer (belated Australian rep 1928-33)
- Apr 7 Kurt von Schleiger, German chancellor (12/2/32-1/28/33)
- Apr 9 Frederick Francis IV, Grand Duke of Mecklenburg-Schwerin, born in Palermo, Italy (d. 1946)
- Apr 10 Simon F H J Berkelbach Van der Sprenkel, theologist (Fear & Religion)
- Apr 14 Moritz Schlick, Austrian philosopher, born in Berlin, Germany (d. 1936)
- Apr 15 Giovanni Amendola, Italian anti-fascist and editor-in-chief (Il Mondo), born in Naples, Italy (d. 1926)
- Apr 16 Seth Bingham, American organist and composer (Six Pieces for Organ), born in Bloomfield, New Jersey (d. 1972)
- Apr 17 Artur Schnabel, Austrian pianist (Beethoven Piano Sonatas), born in Lipnik, Moravia, Austria-Hungary (d. 1951)
- Apr 18 Leopold Stokowski, British conductor (Philadelphia Orchestra, Disney's Fantasia), born in London, England (d. 1977)
- Apr 20 Holland Smith, American General in the U.S. Marine Corps, born in Seale, Alabama (d. 1967)
- Apr 21 Percy Williams Bridgman, American physicist (Nobel 1946 - physics of high pressure), born in Cambridge, Massachusetts (d. 1961)
- Apr 23 Albert Coates, English conductor and composer (Eagle), born in St Petersburg, Russia
- Apr 23 Max Winders, Belgian architect (WWII), responsible for bringing the Belgian gold stock, born in Antwerp, Belgium (d. 1982)
- Apr 24 Hugh Dowding, commander of RAF Fighter Command during the Battle of Britain, born in Moffat, Scotland (d. 1970)
- Apr 25 Fred McLeod, Scottish golfer (US Open 1908), born in North Berwick, Scotland (d. 1976)
- Apr 28 Alberto Pirelli, Italian industrialist, born in Milano, Italy (d. 1971)
- Apr 29 Hendrik Nicolaas Werkman, Dutch artist (The Blue Barge) and resistance fighter, born in Leens, Groningen, Netherlands (d. 1945)
- Apr 30 Nine van de Schaaf, Dutch author (To the Invisible), born in Terhorne, Netherlands (d. 1973)