- Oct 1 Antoine T Broekman, resistance fighter, executed at 32
- Oct 1 Anton JT Koreman, resistance fighter, executed at 27
- Oct 1 Antoon Pleyte, resistance fighter, executed at 26
- Oct 1 Earnest Klijzing, resistance fighter, executed
- Oct 1 Gideon Boissevain, resistance fighter, executed at 22
- Oct 1 Hans Katan, resistance fighter, executed at 24
- Oct 1 Henri H Geul, resistance fighter, executed at 27
- Oct 1 Johan Kalshoven, resistance fighter, executed at 20
- Oct 1 Johan Roemer, resistance fighter, executed at 22
- Oct 1 Johan van Mierlo, resistance fighter, executed at 35
- Oct 1 John Charles Boissevain, resistance fighter, executed at 23
- Oct 1 Leo Frijda, resistance fighter, executed at 20
- Oct 1 Louis Boissevain, resistance fighter, executed at 21
- Oct 1 Maarten van/of Gilse, resistance fighter, executed at 27
- Oct 1 Olaf T Thomsen, resistance fighter, executed at 23
- Oct 1 Peter "Pam" Pooters, resistance fighter, executed at 32
- Oct 1 Sape Kuiper, resistance fighter, executed at 19
- Oct 1 Victor van Swieten, resistance fighter, executed at 36
- Oct 1 Walter Brandligt, literature/resistance fighter, executed at 42
- Oct 2 R. Nathaniel Dett, Canadian-American pianist, organist, choral director, and composer (In The Bottoms), dies of a heart attack while on tour with the USO at 60
- Oct 4 Irena Iłłakowicz, Polish agent of Intelligence, dies at 37
- Oct 4 Richard T. Ely, American economist and author (Ground under our feet), dies at 89
- Oct 5 Leon Roppolo, American early jazz clarinetist, dies at 41
- Oct 6 Robert Cooper, father of Card pitcher Mort & catcher Walker, dies
- Oct 7 Eugeniusz Bodo [Bohdan Eugène Junod], Polish film director, producer and comedic actor, dies in the Gulag at 43
- Oct 7 Marguerite "John" Radclyffe-Hall, English poet and author (The Well of Loneliness), dies of cancer at 63
- Oct 9 Gerard Wilhelm Kernkamp, Dutch historian and editor (Groene Amsterdammer/Green Amsterdam), dies at 78
- Oct 9 Jan Dieters, Dutch politician, resistance fighter, and a leading member of Communist Party of the Netherlands, executed by the Nazis at 42
- Oct 9 Lou Jansen, leader of illegal Dutch political party (CPN), executed
- Oct 9 Pieter Zeeman, Dutch physicist (Nobel Prize 1902 for Zeeman effect), dies at 78
- Oct 10 Charlotte Salomon, German-Jewish artist gassed at Auschwitz aged 26
- Oct 14 Jimmy Matthews, Australian cricket spin bowler (8 Tests, 16 wickets; Victoria; only player to take 2 hat-tricks in same Test 1912), dies at 59
- Oct 17 Stefan Starzyński, Polish politician (b. 1893)
- Oct 18 A. M. de Jong, Dutch writer (World Tour of Bulletje & Bonestaak), dies at 55
- Oct 18 Benedictus H. Danser, Dutch taxonomist and botanist, dies at 52
- Oct 21 Dudley Pound, British admiral of the fleet and 1st Sea Lord (Jutland, WW II), dies at 66
- Oct 22 Josef Venantius von Woss, Austrian composer, dies at 80
- Oct 24 Hector de Saint-Denys Garneau, French Canadian poet (Regards et jeux dans l'espace), dies at 31
- Oct 25 H van Zanten, guerrilla leader on North Sumatra, executed
- Oct 26 Marc Aurel Stein, Hungarian-British archaeologist, dies at 80
- Oct 27 Béla Reinitz, Hungarian composer, dies at 64
- Oct 27 Isidor Traube, German chemist who founded capillary chemistry and researched liquids (osmosis, surface tension), dies at 83
- Oct 31 Max Reinhardt [Goldmann], Austrian theatrical director (Oedipus Rex) and founder of the Salzburg Festival, dies at 70
Assassination
Drug Overdose
Gunshot Wound
Murder
Plane Crash
Suicide