- Sep 3 Cecil Weston, South African actress (Dude Ranch, Huckleberry Finn), born in Capetown (d. 1976)
- Sep 6 Sarat Chandra Bose, Indian activist for independence, born in Howrah, British India (d. 1950)
- Sep 7 Albert Plesman, aviation pioneer/founder/director (KLM)
- Sep 7 Bruce F Cummings, English author (Journal of a Disappointed Man)
- Sep 8 Robert A Taft, (Sen-R-Ohio, Taft-Hartley Act)
- Sep 10 Vilem Petrzelka, composer
- Sep 13 Pierre Reverdy, French poet (Nord-Sud), born in Occitanie (d. 1960)
- Sep 15 Robert Benchley, humorist (My 10 Years in a Quandary), born in Worcester, Massachusetts
- Sep 16 Claude A Barnett, founder (Associated Negro Press)
- Sep 18 Doris Blackburn, Australian politician (d. 1970)
- Sep 19 Ernest Truex, American actor (Fluffy, Scared, His Girl Friday, Pete & Gladys, Mr Peepers), born in Kansas City, Missouri (d. 1973)
- Sep 19 Sarah Delany, author/teacher
- Sep 20 Charles Reidpath, American athlete (d. 1975)
- Sep 21 Otto Forst de Battaglia, Austrian diplomat/genealogist
- Sep 22 Hooks Dauss, American baseball player (d. 1963)
Walter Lippmann
Sep 23 Walter Lippmann, American journalist/political writer (Public Opinion), born in NYC, New York
Walter Lippmann
- Sep 25 George Douglas Howard Cole, socialist/novelist
- Sep 25 C. K. Scott-Moncrieff, Scottish writer and translator (d. 1930)
- Sep 26 Martin Heidegger, German Existentialist (Being & Time)
- Sep 28 Carlos I King of Portugal, Lisbon (1889-1908)
- Sep 28 D P "Dad" Carter, American gospel singer (Chuck Wagon Gang), born near Columbia, Kentucky (d. 1963)
- Sep 28 Jack Fournier, American baseball player (d. 1973)