Editing 1931 (section)

===September===
[[File:Carl Pietzner - Erzherzog Leopold Salvator von %C3%96sterreich-Toskana, 1905 (LC-DIG-ggbain-06226).jpg|thumb|110px|[[Archduke Leopold Salvator of Austria]]]]
[[File:Omar_Mukhtar_13.jpg|thumb|110px|[[Omar al-Mukhtar]]]]
* [[September 4]] – [[Archduke Leopold Salvator of Austria]] (b. [[1863]])
* [[September 5]] – [[John Thomson (footballer, born 1909)|John Thomson]], Scottish footballer (b. [[1909]])
* [[September 7]] – [[Federico Tinoco Granados]], 21st [[President of Costa Rica]] (b. [[1868]])
* [[September 9]] – [[Lujo Brentano]], German economist (b. [[1844]])
* [[September 10]] – [[Salvatore Maranzano]], Italian mobster (b. [[1886]])
* [[September 12]]
** [[Francis J. Higginson]], United States Navy admiral (b. [[1843]])
** [[Joseph Le Brix]], French aviator, naval officer (b. [[1899]])
* [[September 13]] – [[Prince Friedrich Leopold of Prussia]] (b. [[1866]])
* [[September 14]] – [[Tom Roberts]], English-born Australian artist (b. [[1856]])
* [[September 16]] – [[Omar al-Mukhtar]], [[Libya]]n resistance leader (b. [[1858]])
* [[September 17]] 
** [[Marcello Amero D'Aste]], Italian admiral, politician (b. [[1853]])
** [[Marvin Hart]], American world heavyweight boxing champion (b. [[1876]])
* [[September 18]] – [[Geli Raubal]], German niece of  Adolf Hitler (suicide; b. [[1908]])
* [[September 19]] – [[David Starr Jordan]], American ichthyologist, educator, eugenicist, and peace activist (b. [[1851]])<ref>{{cite news |url=https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=HT19310919.2.20 |title=Dr. David Starr Jordan Dies; Family With Educator As Passes Away: Fifth Attack Ends an Illness of Two Years |newspaper=[[Healdsburg Tribune]] |page=1 |number=269 |date=September 19, 1931 |author=<!--Staff writer(s); no by-line.--> |via=[[California Digital Newspaper Collection]]|access-date=June 1, 2018 |archive-date=July 1, 2018 |archive-url=https://web.archive.org/web/20180701055032/https://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=HT19310919.2.20 |url-status=live }}</ref>
* [[September 29]] – [[William Orpen|Sir William Orpen]], Irish artist (b. [[1878]])