- Oct 1 Berkshire Cattle Fair held in Pittsfield Mass (1st state fair)
- Oct 1 Explosion at LA Times kills 21
- Oct 1 Regina Rugby Club (to become CFL Saskatchewan Roughriders) plays first game, losing to Moose Jaw Tigers, 16-6
- Oct 2 1st 2 aircraft collision (Milan Italy)
- Oct 2 Henry Wijnmalen flies to 2,800m altitude (world record)
- Oct 4 Portugal becomes a republic, King Manuel II flees to England
- Oct 4 Adoption of the Flag of Bermuda.
- Oct 5 Portugal overthrows monarchy, proclaims republic
- Oct 6 Braves beat Phillies 20-7
Historic Publication
Oct 18 E. M. Forster publishes novel "Howards End"
E. M. Forster
- Oct 20 1st appearance of cork centered baseball in World Series
- Oct 20 Soccer team KFC forms in Alkmaar
- Oct 20 The hull of the RMS Olympic, sister-ship to the ill-fated RMS Titanic, is launched from the Harland and Wolff shipyard in Belfast, Ireland.
- Oct 22 Dr. Crippen is convicted at the Old Bailey of poisoning his wife and was subsequently hanged at Pentonville Prison in London.
- Oct 23 Blanche Scott becomes the first woman to fly at a public event in the US at Fort Wayne, Indiana.
- Oct 23 World Series Baseball, West Side Park, Chicago: Philadelphia A's beat Chicago Cubs, 7-2 in Game 5 to win their first title, 4-1
- Oct 23 Ritz Hotel in Madrid opens with 200 chambers and 100 bathtubs
- Oct 29 Hamilton running back / kicker Ben Simpson lands CFL record 11 singles in Tigers 14-7 win over Montreal at Montreal AAA Grounds