- Oct 5 Roland Garros, French stunt flyer, dies
- Oct 6 Arthur O'Hara Wood, Australian tennis player (Australasian C'ship 1914), dies in action WWI at 28
- Oct 7 Hubert Parry, English musicologist and composer (Jerusalem), dies at 70
- Oct 9 Mikhail Vasilyevich Alekseyev, Imperial Russian general and WWI Chief of Staff, murdered at 60
- Oct 9 Raymond Duchamp-Villon, French cubist sculptor (Head of Baudeaire), dies at 41
- Oct 13 Gerrit Engelke, German writer and poet (Briefer der Liebe), dies fighting in WWI at 27
- Oct 15 Sai Baba of Shirdi, Indian saint (b. circa 1838)
- Oct 16 Felix Arndt, American organist, pianist, arranger, and composer ("Desecration Rag"; "Nola"), dies during the Spanish Flu pandemic at 29 [1]
- Oct 17 Gordon White, cricketer (WW I Superb South African batsman 1905-12), dies
- Oct 19 Harold Lockwood, American actor (Tess of the Storm Country), dies from the flu at 31
- Oct 19 Joseph Lesage, French painter/etcher (WWI), dies at 34
- Oct 22 Myrtle Gonzalez, American silent film actress regarded as Hollywood's first Latin and Hispanic movie star actress (Missy, The Chalice of Courage, Her Great Part), dies from influenza and heart ailment at 27
- Oct 24 Alexander Charles Lecocq, composer, dies at 86
- Oct 28 Edward Bouchet, American Physicist, 1st African American to receive US Ph.D, dies at 66
- Oct 28 Ulisse Dini, Italian mathematician and politician (Fondamenti per la teorica delle funzioni di variabili reali), dies at 72
- Oct 31 Egon Schiele, Austrian painter and graphic artist, dies at 28
- Oct 31 [Stephen] István Tisza, Hungarian PM (1903-05, 1913-17), assassinated by soldiers at 57
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide