August 17 is the 229th day of the year.
- 1786, Thursday: Davy Crockett is born in Limestone, Green County, US.
- 1896, Monday: Leslie Groves, the major general of the United States Army who led the Manhattan Project, is born.
- 1930, Sunday: Charles L. Campbell (Sound editor for Back to the Future and voice for the KKHV weatherman in 1955) is born in Detroit Michigan.
- 1969, Sunday: Woodstock continues at Yasgur's Farm.