August 21st
- 1811 – William Kelly born.
- 1825 – John Richard Barret born.
- 1841 – Pierman Powell born.
- 1871 – Andrew Trumbo died, aged 73.
- 1899 – Olive Blakeney born.
- 1919 – Bob Clark died, aged 56.
- 1941 – Jackie DeShannon born.
- 1949 – Malachi Thompson born.
- 1955 – The Kelly-Hopkinsville Encounter occurred.