- Oct 3 British Open Men's Golf, Prestwick GC: Jack Simpson wins in windy conditions by 4 strokes from fellow Scots Douglas Rolland and Willie Fernie
- Oct 6 Naval War College forms in Newport, Rhode Island
- Oct 13 International Meridian Conference in Washington DC establishes Greenwich in London, England as the universal time meridian of longitude
Photographic Film
Oct 14 George Eastman patents paper-strip photographic film
- Oct 15 Charles "Old Hoss" Radbourn pitches his 60th win of season for MLB Providence Grays in 8-0 win over Quakers at Philadelphia
- Oct 22 General Gordon receives letter of Mahdi
- Oct 22 International Meridian Conference in Washington, D.C. adopts Greenwich Mean Time (GMT) worldwide, creating 24 international time zones with longitude zero at the Greenwich meridian
- Oct 22 Sporting Life announces that both pennant winners will meet in 3 game series Oct 23-25 at Polo Grounds NYC to determine baseball champion
- Oct 25 1st "World Championship" Baseball Series, Polo Grounds, NYC: Providence Grays (NL) beat NY Mets (American Association), 12-2 in 6 innings for 3 game sweep; game abandoned because of bitter cold
- Oct 27 Architect Henry Hardenberghs Dakota apartment complex opens in NYC
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists