Authors Born on August 21
- Peter Weir Director, 1944
- Princess Margaret Royalty, 1930
- Robert Lewandowski Football Player, 1988
- Saint Francis de Sales Clergyman, 1567
- Sean Doyle Chief Executive Officer, 1970
- Serj Tankian Musician, 1967
- Sharon Draper Writer, 1948
- Steve Case Businessman, 1958
- Stéphane Charbonnier Caricaturist, 1967
- Tyler Winklevoss Rower, 1981
- Usain Bolt Sprinter, 1986
- Walter Block Economist, 1941
- Warryn Campbell Record Producer, 1975
- William Henry Ogilvie Poet, 1869
- William J. Critchlow, Jr. Author, 1892
- William Pepper Physician, 1843
- Willie Lanier American Football Player, 1945
- Wilt Chamberlain Basketball Player, 1936
- X. J. Kennedy Author, 1929