- Jul 4 Antoni Ĺomnicki, Polish mathematician (b. 1881)
- Jul 5 Oskar Fried, composer, dies at 69
- Jul 8 Philippe Gaubert, French musician and composer, dies at 62
- Jul 8 Moses Schorr, Polish rabbi, senator, historian and orientalist (b. 1874)
- Jul 10 Ferdinand "Jelly Roll" Morton, pioneer jazz pianist, dies in LA at 56
- Jul 17 Emil Barth, German revolutionary (Social Democratic Party), dies at 62
- Jul 18 Dionyssios Lavrangas, composer, dies at 80
- Jul 20 Lew Fields, American vaudeville performer (b. 1867)
- Jul 21 Bohdan Lepky, Ukrainian writer and poet, dies at 68
- Jul 26 Benjamin Whorf, anthropologist, dies
- Jul 26 Marx Dormoy, French socialist, killed by a time bomb
- Jul 26 Benjamin Lee Whorf, American linguist (the relation of language to thinking and cognition), dies at 44
- Jul 26 Henri Lebesgue, French mathematician (Lebesgue integration), dies at 66
- Jul 27 Alfred Henry O'Keeffe, New Zealand artist, dies at 83
- Jul 29 James Stephenson, British actor (Letter, Espionage Agent, Nancy Drew), dies at 52