- Sep 1 Roger David Casement, Irish diplomat, nationalist (Easter uprising 1916), and poet, born in Sandycove, Dublin, Ireland (d. 1916)
- Sep 3 Hale A. VanderCook, American composer, born in Ann Arbor, Michigan (d. 1949)
- Sep 7 Ernest Halliwell, South African cricket wicketkeeper (8 Tests), born in Ealing, England (d. 1919)
- Sep 7 Giovanni Tebaldini, Italian composer, born in Brescia, Lombardy, Italy (d. 1952)
- Sep 14 Robert Cecil, 1st Viscount Cecil of Chelwood, British lawyer and politician who helps form League of Nations (Nobel 1937), born in Cavendish Square, London (d. 1958)
- Sep 22 Lodewijk van Deyssel, Dutch writer (A Love Affair), born in Amsterdam, Netherlands (d. 1952)
- Sep 23 Draga Mašin, Queen of Serbia (d. 1903)
- Sep 27 Alexander Cohen, Dutch anarchist and author, born in Leeuwarden, Netherlands (d. 1961)
- Sep 27 Andrej Hlinka, Slovak politician and Catholic priest, born in Liptó County, Kingdom of Hungary, Austria-Hungary (d. 1938)
- Sep 28 Barry Pain, English writer (Punch), born in Cambridge, England (d. 1928)
- Sep 29 Miguel de Unamuno, Spanish writer and philosopher (Ensayos, Teatro), born in Bilbao Spain (d. 1936)