- Sep 3 Olga Constantinovna of Russia, Queen consort of the Hellenes as the wife of King George I, born in Pavlovsk, Russian Empire (d. 1926)
- Sep 4 John Dillon, Irish nationalist and British Lower house leader, born in Blackrock, Dublin (d. 1927)
- Sep 7 Edward Asahel Birge, American pioneer in limnology, born in Troy, New York (d. 1950)
- Sep 13 Walter Reed, U.S. Army physician and bacteriologist who proved mosquitoes transmit yellow fever, born in Belroi, Virginia (d. 1902)
- Sep 15 Josif Marinković, Serbian composer, born in Vranjevo, Novi Bečej (d. 1931)
- Sep 16 Emilia Pardo Bazán, Spanish countess and writer (Pascual López: Autobiography of a Medical Student), born in La Coruña, Spain (d. 1921)
- Sep 28 Henry Arthur Jones, English playwright (Judah), born in Grandborough, Buckinghamshire, England (d. 1929)