Authors Born on September 21
- Agnivesh Politician, 1939
- Ahna O'Reilly Actress, 1984
- Aleksa Palladino Actress, 1980
- Alexandra Cassavetes Actress, 1965
- Alfonso Ribeiro Actor, 1971
- Allison Scagliotti Actress, 1990
- Anne Burrell Chef, 1969
- Aslan Maskhadov Politician, 1951
- Autumn Reeser Actress, 1980
- Barbara Brown Taylor Priest, 1951
- Bernard Williams Philosopher, 1929
- Bilawal Bhutto Zardari Politician, 1988
- Bill Kurtis Journalist, 1940
- Bill Murray Actor, 1950
- Billy Porter Actor, 1969
- Brendan I. Koerner Author, 1974
- C. J. Mahaney Minister, 1953
- Caleb Deschanel Cinematographer, 1944
- Cass Sunstein Scientist, 1954
- Charles Clarke Politician, 1950
- Charles Nicolle Scientist, 1866
- Cheryl Hines Actress, 1965
- Chris Avery American Football Player, 1975
- Chris Gayle Cricketer, 1979
- Christian Serratos Actress, 1990
- Chuck Jones Film Maker, 1912
- Craig Thompson Novelist, 1975
- Daniel Humm Chef, 1976
- Dave Coulier Actor, 1959
- David Frawley Activist, 1950
- David Grubbs Composer, 1967
- David Hood Bassist, 1943
- David James Elliott Actor, 1960
- David Mazzucchelli Comics Artist, 1960
- David Sylvester Art Critic, 1924
- David Travis Member Of Parliament, 1948
- David Wenham Actor, 1965
- Dawn Addams Actress, 1930
- Dean Baquet Journalist, 1956
- Don Felder Musician, 1947