- Sep 1 Blaise Cendrars [Frederic Sauser-Hall], Swiss poet and writer, born in La Chaux-de-Fond, Switzerland (d. 1961)
- Sep 1 Otto Eissfeldt, German old testament scholar, born in Northeim, Germany (d. 1973)
- Sep 3 Frank Christian, American jazz trumpeter, born in Bywater, New Orleans, Louisiana (d. 1973)
- Sep 7 Edith Sitwell, English poet and author (Wheels), born in Scarborough, North Yorkshire (d. 1964)
- Sep 8 George, Crown Prince of Serbia, eldest son of King Peter I, born in Cetinje, Montenegro (d. 1972)
- Sep 9 Alf Landon, American politician, Governor of Kansas (1933-37) and Republican Presidential nominee in 1936, born in West Middlesex, Pennsylvania (d. 1987)
- Sep 9 Raymond Walburn, American actor (Christmas in July), born in Plymouth, Indiana (d. 1969)
- Sep 10 Giovanni Gronchi, Italian politician, President of Italy (1955-62), born in Pontedera, Italy (d. 1978)
- Sep 12 George Georgescu, Romanian conductor and composer, born in Sulina, Romania (d. 1964)
- Sep 13 Leopold Ružička, Croatian-Swiss chemist (Nobel 1939), born in Vukovar, Croatia (d. 1976)
- Sep 14 Karl Taylor Compton, American physicist and 9th President of the Massachusetts Institute of Technology, born in Wooster, Ohio (d. 1954)
- Sep 14 Stanley Ketchel [The Michigan Assassin], Polish-American heavyweight boxing champion (1908-10), born in Grand Rapids, Michigan (d. 1910)
- Sep 15 Carlos Dávila, President of Government Junta of Chile (1932), born in Los Ángeles, Chile (d. 1955)
- Sep 16 (Hans) "Jean" Arp, German-French sculptor, artist and poet, born in Strassburg, Alsace-Lorraine, German Empire (now Strasbourg, France) (d. 1966)
- Sep 16 Nadia Boulanger, French composer and conductor (1st woman to conduct Boston Symphony), born in Paris, France (d. 1979)
- Sep 19 Lovie [Cora] Austin, American jazz pianist ("Down Hearted Blues"), born in Chattanooga, Tennessee (d. 1972)
- Sep 19 Lynne Overman, American actor (Reap the Wild Wind), born in Maryville, Missouri (d. 1943)
- Sep 21 Lodewijk de Vocht, Belgian composer (Prayer for My Fatherland), conductor, kapellmeister (Antwerp Cathedral, 1913-50), and educator (Antwerp Conservatory, 1921-52), born in Antwerp (d. 1977)
- Sep 23 Alfieri Maserati, Italian auto racer and engineer (established Maserati Racing), born in Voghera, Italy (d. 1932)
- Sep 26 Antonio Moreno, Spanish actor and director (It, Careers), born in Madrid, Spain (d. 1967)
- Sep 26 Barnes Wallis, English scientist, engineer and inventor (bouncing bomb), born in Ripley, Derbyshire, England (d. 1979)
- Sep 26 Edwin Keppel Bennett, English writer (Built in Jerusalem’s Wall: A Book in praise of Jerusalem), born in Wareham, Dorset, England (d. 1958)
- Sep 27 Anton Roemer, Dutch actor (Potasch & Perlemoer, Boefje), born in Amsterdam, Noord-Holland, Netherlands (d. 1951)
- Sep 28 Avery Brundage, American businessman (5th President International Olympic Committee 1952-72), born in Detroit, Michigan (d. 1975)
- Sep 29 Billy Bevan, Australian actor (Terror by Night, White Sin), born in Orange, New South Wales, Australia (d. 1957)
- Sep 30 Lil Dagover [Marta-Maria Lillits], Dutch-born German actress (Spiders), born in Madioen, Dutch East Indies (d. 1980)