- August 5, 1942, businessman Simon Benson of the "Benson Bubblers" fame dies.
- August 7, 1958, Alberto Salazar, marathon runner and member of the Oregon Sports Hall of Fame, is born in Cuba.
- August 9, 1977, Portland State University alumnus and one-time Portland Trail Blazers forward Ime Udoka is born in Portland.
- August 14, 1848, the Oregon Territory is created when President Polk signs a bill passed by Congress.
- August 15, 2003, judge Rives Kistler is appointed to the Oregon Supreme Court and becomes the first openly gay justice on the court.
- August 17, 1857, the Oregon Constitutional Convention begins meeting in Salem.
- August 27, 1966, the Astoria–Megler Bridge opens across the Columbia River, linking Astoria to Washington state.
- August 28, 1970, Vortex I, a state-sponsored rock music festival, begins in Clackamas County.
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