- Sep 5 Ignacij Klemenčič, Slovenian physicist (b. 1853)
- Sep 9 Henri de Toulouse-Lautrec, French painter, dies at 36
- Sep 9 Willem baron of Goltstein of Oldenaller, minister of Cologne dies
William McKinley
Sep 14 US President William McKinley, dies in Buffalo, after being shot 8 days earlier by anarchist, Leon Czolgosz
William McKinley
- Sep 25 Arthur Fremantle, British general and American Civil War observer (b. 1835)