- Aug 1 Whiskey Rebellion begins in western Pennsylvania
- Aug 8 Joseph Whidbey and George Vancouver lead an expedition to search for the Northwest Passage near Juneau, Alaska
- Aug 16 Hungarian revolutionary Ignác Martinovics arrested in Vienna
Victory in Battle
Aug 20 Battle of Fallen Timbers: Major General "Mad Anthony" Wayne defeats a joint British-Native American force at Fallen Timbers, Ohio in the final battle of the Northwest Indian War
Anthony Wayne
- Aug 26 French troops occupy Lock