- Oct 5 Boston Red Sox beat Philadelphia Athletics, 3 - 0 for their 105th win of the MLB season, an AL record until 1927 NY Yankees (110)
- Oct 5 NY Highlanders last game at Hilltop stadium; beat Washington, 8-6; Brooklyn Dodgers last game at Washington Park; lose 1-0 v NY Giants
- Oct 6 Pirates Owen "Chief" Wilson hits record 36th triple of season
- Oct 7 The Helsinki Stock Exchange sees its first transaction.
- Oct 8 Montenegro declares war on Turkey, beginning 1st Balkan War
- Oct 14 Bull Moose Teddy Roosevelt shot while campaigning in Milwaukee
- Oct 14 Cretan representatives are admitted to the Greek assembly; in doing so the Greek Government challenges the Turkish Government
Speaker's Double Play
Oct 15 Red Sox Tris Speaker's makes only world series unassisted double play, from the outfield
Pierrot Lunaire
Oct 16 Arnold Schoenberg's "Pierrot Lunaire," premieres at the Berlin Choralion-Saal sung by Albertine Zehme
- Oct 16 Baseball World Series: Boston Red Sox beat NY Giants, 3-2 at Fenway Park to clinch a 4-3-1 series win; series extended to 8 games as one game tied due to darkness
- Oct 17 Bulgaria, Greece & Serbia declares war on Turkey
Jack Johnson Arrested
Oct 18 Black boxer Jack Johnson arrested for violating the Mann Act for "transporting women across state lines for immoral purposes" due to his relationship with white woman Lucille Cameron, allegedly a prostitute. Later convicted by an all-white jury and sentenced to a year in prison.
- Oct 18 The First Balkan War breaks out, with Bulgaria, Serbia, and Greece opposed to Turkey
Italo-Turkish War
Oct 18 The Treaty of Lausanne ends the Italo-Turkish War; Italy annexes Libya
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists