- Apr 2 Theodore Richards, US chemist (atomic weight, Nobel 1914), dies
- Apr 5 Jane Ellen Harrison, British anthropologist and linguist, dies at 77
- Apr 5 Roy Kilner, cricketer (9 Tests for England 1924-26), dies at 38
- Apr 7 Alexander Bogdanov, Russian physician and philosopher, dies at 54
- Apr 13 Luis Iruarrizaga Aguirre, Basque priest, organist and composer of religious music, dies at 36
- Apr 16 Henry Birks, Canadian businessman and founder of Henri Birks and Sons, dies at 87
- Apr 18 Henryk Melcer-Szczawiński, Polish pianist, composer, and conductor, dies of a heart attack at 58
- Apr 24 Ferdinand Hummel, German composer, dies at 72
- Apr 25 Pyotr Nikolayevich, Baron Wrangel, Russian baron general (White Armies, WW II), dies at 49
- Apr 29 Henrich Federer, Swiss writer (I Switch Off The Light), dies at 61