| Date | Weekday | Event |
|---|
| August 9, 1332 | Saturday | Battle of Dupplin Moor (in Scotland) |
|
| August 9, 1778 | Sunday | Capt. Cook passes through Bering Strait |
| August 9, 1786 | Wednesday | 1st ascent of Mt. Blanc |
| August 9, 1803 | Tuesday | 1st horses arrive in Hawaii |
| August 9, 1842 | Tuesday | US-Canada border defined by the Webster-Ashburton Treaty |
| August 9, 1848 | Wednesday | Free-Soil Party nominates Martin Van Buren for president |
| August 9, 1849 | Thursday | Hungarian Republic crushed by Austria & Russia |
| August 9, 1854 | Wednesday | Henry David Thoreau published `Walden' |
| August 9, 1902 | Saturday | Edward VII of England crowned after death of his mother Victoria. |
| August 9, 1925 | Sunday | Only time Babe Ruth was pinch hit for Bobby Veach flied out |
| August 9, 1930 | Saturday | Betty Boop debutes in Max Fleischer's animated cartoon Dizzy Dishes. |
| August 9, 1936 | Sunday | Jesse Owens won his fourth gold medal of the Berlin Olympics |
| August 9, 1942 | Sunday | Britain arrested Indian nationalist Mohandas K. Gandhi |
| August 9, 1945 | Thursday | US drops 2nd atomic bomb on Japan destroying part of Nagasaki |
| August 9, 1956 | Thursday | 1st state-wide state-supported educational TV network Alabama |
| August 9, 1956 | Thursday | South African women demonstrate against pass laws |
| August 9, 1965 | Monday | Singapore gains independence from Malaysia (National Day) |
| August 9, 1969 | Saturday | The Manson family commits the Tate-LaBianca murders |
| August 9, 1973 | Thursday | USSR launches Mars 7 |
| August 9, 1974 | Friday | Richard Nixon resigns presidency |
| August 9, 1978 | Wednesday | Yanks score 5 in bottom of 9th beat Brewers 8-7 |