- Oct 2 Cordell Hull, American Secretary of State (1933-44) who established United Nation (Nobel 1945), born in Olympus, Tennessee (d. 1955)
- Oct 2 Martha Brookes Hutcheson, American landscape architect, born in New York City (d. 1959)
- Oct 3 Stijn Streuvels [Frank Lateur], Flemish writer (De Valschaard), born in Heule, Belgium (d. 1969)
- Oct 9 Didak Buntić, Croatian monk and scholar, born in Paoča, Bosnia and Herzegovina (d. 1922)
- Oct 9 George Gauthier, Bishop of Montreal and rector of the Université de Montréal, born in Montreal, Quebec (d. 1940)
- Oct 9 Gerrit Bolkestein, Dutch minister of Education (1939-45), born in Amsterdam, Netherlands (d. 1956)
- Oct 11 Johan Oscar Smith, Norwegian Christian leader who founded the evangelical Brunstad Christian Church, born in Fredrikstad, Norway (d. 1943)
- Oct 14 Alexander von Zemlinsky, Austrian composer, conductor, and arranger (The Mermaid; Lyric Symphony), born in Vienna, Austria (d. 1942)
- Oct 18 Louis de Vries, Dutch actor (Blokkade, Ghetto), born in Amsterdam, Noord-Holland, Netherlands (d. 1940)
- Oct 19 Walter Bradford Cannon, American physiologist (Wisdom of the Body, coined term "fight or flight response"), born in Prairie du Chien, Wisconsin (d. 1945)
- Oct 20 Frederick Burton, American actor (The Big Trail, One Way Passage), born in Indianapolis, Indiana (d. 1957)
- Oct 26 Guillermo Kahlo, German-Mexican photographer and father of Frida Kahlo, born in Pforzheim, Grand Duchy of Baden, German Empire (d. 1941)
- Oct 26 Hermann Löhr, British composer, born in Plymouth, England (d. 1943)
- Oct 29 Narziss Ach, German psychologist (Analyse des Willens), born in Ermershausen, Kingdom of Bavaria, German Empire (d. 1946)
- Oct 30 Buck Freeman, American baseball outfielder (World Series 1903; HR leader 1899, 1903; AL RBI leader 1902, 03; Boston Americans), born in Catasauqua, Pennsylvania (d. 1949)
- Oct 30 Paul Valéry [Ambroise Paul Toussaint Jules Valéry], French author, philosopher and poet (La Jeune Parque), born in Sète, France (d. 1945)