Ivan Stang (born Douglass St. Clair Smith; August 21, 1953) is an American writer, filmmaker and broadcaster, best known as the author and publisher of the first screed of the Church of the SubGenius.

Tsutomu Miyazaki (宮﨑 勤, Miyazaki Tsutomu; 21 August 1962 – 17 June 2008) was a Japanese serial killer who murdered four young girls in Tokyo and Saitama Prefecture between August 1988 and June 1989. He abducted and killed the girls, aged from 4 to 7, in his car before dismembering them and molesting their corpses.

George Clarence "Bugs" Moran (; born Adelard Leo Cunin; August 21, 1893 – February 25, 1957) was an American Chicago Prohibition-era gangster. He was incarcerated three times before his 21st birthday.

Benjamin Boyd (21 August 1801 – 15 October 1851) was a Scottish entrepreneur who became a major shipowner, banker, grazier, politician and blackbirder in the British colony of New South Wales. He was briefly a member of the Legislative Council.

Yukio Yamaji (山地 悠紀夫, Yamaji Yukio; August 21, 1983 – July 28, 2009) was a Japanese serial killer. He murdered his own mother in 2000, was imprisoned, and then paroled in 2003.

Jaroslava Fabiánová (born 1965) is a Czech serial killer who committed a total of four financially motivated murders between 1981 and 2003. She is currently serving a life imprisonment sentence for four murders and other crimes.

Sachiko Eto (江藤 幸子, Etō Sachiko; August 21, 1947 – September 27, 2012), known as The Drumstick Killer, was a Japanese cult leader and serial killer, responsible for six murders in Sukagawa City between 1994 and 1995.

David Alan Gore (August 21, 1953 – April 12, 2012) was an American serial killer who committed six murders in Vero Beach and Indian River County, Florida, from 1981 to 1983. He was accompanied in several of the murders by his cousin, Fred Waterfield, and both have collectively been dubbed the Killing Cousins.