- Aug 2 After 3 hours deliberation a Chicago jury acquits 8 Chicago White Sox accused in Black Sox scandal; next day they are banned from organised baseball for life
- Aug 3 1st aerial crop dusting in Troy, Ohio, to kill caterpillars
- Aug 3 MLB Commissioner Kenesaw Landis hands out life bans to 8 Chicago White Sox players accused in Black Sox scandal despite their acquittal by a Chicago jury
Moeskops Wins 1st Sprint Championship
Aug 7 Dutch cyclist Piet Moeskops wins the 1st of 4 straight, and 5 total world sprint championships when he beats defending champion Bob Spears of Australia in Copenhagen
FDR Struck Down with Illness
Aug 10 FDR stricken with a paralytic illness at summer home on Canadian island of Campobello. At the time it was thought to be polio, but could possibly have been Guillain–Barré syndrome
Dulcy
Aug 13 Simon Kaufman & Marc Connelly's comedic play "Dulcy" premieres in NYC
- Aug 20 US National Championship Women's Tennis, Germantown CC, PA: Molla Bjurstedt Mallory wins her 6th US singles title; beats 3-time champion Mary Browne 4-6, 6-4, 6-2
Rise of J. Edgar Hoover
Aug 22 J. Edgar Hoover appointed Assistant Director of the Bureau of Investigation
- Aug 23 Austria and the US formally end war; the US does the same with Germany on the 25th, and Hungary on the 29th
- Aug 23 British declare a truce with Irish Nationalists Sinn Féin
- Aug 24 Battle of Sakaray Valley begins between Turkey & Greece
- Aug 24 British airship R-38 crashes in River Humber, 44 die
- Aug 25 The first skirmishes of the Battle of Blair Mountain, a civil uprising in Logan County, West Virginia
- Aug 25 US signs peace treaty with Germany
- Aug 25 Yankee pitcher Harry Harper hits 3 batters in an inning tying record
- Aug 27 J E Clair of Acme Packing Co of Green Bay granted an NFL franchise
- Aug 28 2nd Pan-African Congress meets (London, Brussels & Paris)