- Aug 4 Richard Kiepert, German cartographer (Africa), dies at 68
- Aug 9 Henry Longbottom, English lieutenant, dies in battle
- Aug 10 Henry Moseley, English physicist (b. 1887)
- Aug 15 Albert Siegfried Bettelheim, Jew convicted of murder, lynched
- Aug 15 Constantin Fahlberg, Russian chemist who discovered Saccharin (artificial sweetener), dies at 59
- Aug 17 Leo Frank, American convict, hanged in 1915 by a lynch mob in Georgia at 31
- Aug 20 Paul Ehrlich, German bacteriologist and physician (Chemotherapy, Nobel Prize 1908), dies in 61
- Aug 26 John Bunny American film comedian, dies at 51
- Aug 28 John Davis Long, 32nd Governor of Massachusetts (1880-1915), dies at 76