- Oct 2 First Rugby Union match is played at the English RFU owned Twickenham ground; Harlequins beat Richmond, 14-10
- Oct 8 Chicago Cubs beat NY Giants 4-2 in a playoff to win NL pennant
- Oct 14 Pirates beat Tigers, 5-4, forces 1st full 7 game world series
- Oct 16 In his 4th title defence Jack Johnson KOs Stanley Ketchel in the 12th round at Mission St Arena, Colma, California to retain his heavyweight boxing crown
- Oct 16 Pirates beat Tigers 4 games to 3 in 6th World Series
- Oct 18 Comte de Lambert of France sets airplane altitude record of 300 m
- Oct 24 Italy and Russia sign the Racconigi Pact in which both nations promise to support the status quo in the Balkans
- Oct 25 Australasian Championships Men's Tennis, Perth: Anthony Wilding of New Zealand wins his 2nd Australasian title; beats Ernie Parker of Australia 6β1, 7β5, 6β2
- Oct 26 ItΕ Hirobumi, Resident-General of Korea, and former Japanese Prime Minister is shot and killed by Korean nationalist An Jung-geun in Harbin, China