- Aug 1 British troops enter Vladivostok
- Aug 1 Pittsburgh and Boston Braves play a MLB record 20 scoreless innings before Pirates win, 2-0 in 21
- Aug 2 Japan announces that it is deploying troops to Siberia in the aftermath of World War I
- Aug 3 The first allied troops land at Archangel, the Russian port on the White Seas
Hitler Receives Bravery Award
Aug 4 Adolf Hitler receives the Iron Cross first class for bravery on the recommendation of his Jewish superior, Lieutenant Hugo Gutmann
- Aug 6 Ferdinand Foch becomes Marshal of France during WWI
- Aug 6 World War I: Second Battle of the Marne ends
- Aug 8 World War I: The Allies launch the Hundred Days Offensive, beginning with the Battle of Amiens where 500 tanks and 10 Allied divisions attacked German lines
- Aug 9 Cincinnati Reds manager Christy Mathewson suspects Hal Chase of taking bribes to fix games, and suspends him "for indifferent play"
- Aug 12 WWI: Allies defeat Germans at the Battle of Amiens - the last great battle on the Western Front
- Aug 13 Bayerische Motoren Werke AG (BMW) established as a public company in Germany
- Aug 15 Longest work of animation then produced - "The Sinking of Lusitania" by Winsor McCay
- Aug 16 US troops overrun at Archangelsk by Bolshevik troops
- Aug 17 Bolshevik revolutionary leader Moisei Uritsky is assassinated
- Aug 17 British troops attack Baku, Azerbaijan
- Aug 17 Samuel Riddle buys Man o'War for $5,000
- Aug 17 Turkish troops overthrow Caukasus
Yip Yip Yaphank
Aug 19 Irving Berlin's military musical revue "Yip Yip Yaphank" opens at the Century Theater, later transferring to the Lexington, NYC
- Aug 20 WWI: Britain opens offensive on Western front
- Aug 24 Chicago Cubs, win earliest pennent ever (season ended Sept 2)
- Aug 24 Sect Baker grants extended exemption to World Series players
- Aug 26 Winchell Smith & Frank Bacon's comedic play "Lightnin'" premieres in NYC
- Aug 27 Christy Mathewson resigns as Cincinnati Reds manager to accept a commission as a captain in chemical warfare branch of US Army
- Aug 27 Dr Joseph L Johnson named as US minister to Liberia
The 1918 Flu Pandemic
Aug 27 Spanish flu arrives in Boston, beginning of the second wave and deadliest wave in the US
Suspension of Tris Speaker
Aug 28 Tris Speaker suspended for season due to assault on umpire Tom Connolly
Second Battle of Bapaume
Aug 29 WWI: Bapaume, France re-taken from the Germans in the Second Battle of Bapaume by British, Australian, NZ and Canadian Corps in the Hundred Days Offensive
- Aug 30 Czechoslovakia forms independent republic
- Aug 31 Boston Red Sox, win earliest AL pennent ever (season ended Sept 2)
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists