- Sep 1 Engelbert Humperdinck, German opera composer (Hänsel und Gretel), born in Siegburg, Westphalia (d. 1921)
- Sep 2 Hans Jæger, Norwegian writer and political activist (d. 1910)
- Sep 8 Willem Marinus van Rossum, Dutch cardinal and prefect of Propaganda File, born in Zwolle, Overijssel, Netherlands (d. 1932)
- Sep 10 Anton Dreesmann, German-Dutch manufacturer (Vroom & Dreesman), born in Haselünne, Germany (d. 1934)
- Sep 17 David Dunbar Buick, Scottish-American automobile pioneer (Buick Motor Company), born in Arbroath, Angus, Scotland (d. 1929)
- Sep 17 Hans Müller, German music historian and writer, born in Cologne, Germany (d. 1897)
- Sep 23 Cornelis Lely, Dutch civil engineer (Zuiderzee dam and dyke works), Governor of Suriname (1902-05), born in Amsterdam, Netherlands (d. 1929)
- Sep 28 Adam Sedgwick, English zoologist (Peripatus), born in Norwich, England (d. 1913)
- Sep 29 Martin Pluddemann, German composer, born in Kolberg (d. 1897)