- Sep 3 For the only time in Olympic Games history, there is a throw-off in the discus final after Americans Martin Sheridan & Ralph Rose tie with a best throw of 128' 10½" in St. Louis; Sheridan wins with 127' 10¼"
- Sep 4 Dalai Lama signs treaty allowing British commerce in Tibet
- Sep 6 Soccer team Rheden forms
- Sep 7 British forces in Tibet force the 13th Dalai Lama to sign a treaty granting Britain trading posts in Tibet and a guarantee that Tibet will not concede territory to foreign powers
- Sep 9 Boston Herald again refers to NY baseball club as Yankees, when it reports "Yankees take 2," Yankee name not official till 1913
- Sep 9 Mounted police first appear in NYC
- Sep 19 Gen Nogi's assault on Port Arthur: 16,000 Japanese casualties
- Sep 20 George Ade's "College Widow," premieres in NYC
Wright Brothers Fly a Circle
Sep 20 Orville and Wilbur Wright fly a circle in their Flyer II
- Sep 21 The general strike called by the Socialist Party that spread throughout Italy ends
- Sep 23 British Colonel Francis Younghusband and his expedition with accompanying military force leave Lhasa, Tibet
- Sep 25 Charles Follis becomes first American black man contracted to play pro football on an integrated team when he signs with Shelby Blues of the "Ohio League"
- Sep 26 Charles Kleins "Music Master" premieres in NYC
- Sep 26 Earl Grey is named British governor-general of Canada
- Sep 26 GB Shaw's "How He Lied to Her Husband" premieres in NYC
- Sep 28 Woman arrested for smoking a cigarette in a car on 5th Avenue, NYC
- Sep 29 1st monument honoring Spanish–American War erected, in Monroeville, Ohio
- Sep 30 White Sox lefty Doc White, pitches his 5th shutout in 18 days
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