Authors Born on October 21
- Nemanja Vidic Football Player, 1981
- Nicole Williams Author, 1980
- Pat Tiberi Politician, 1962
- Patricia Espinosa Diplomat, 1958
- Patrick Kavanagh Writer, 1904
- Patti Davis Actress, 1952
- Paul Brunton Philosopher, 1898
- Paul Ince Football Manager, 1967
- Peter Mandelson Politician, 1953
- Riccardo Fogli Singer, 1947
- Rich Mullins Singer, 1955
- Samuel Taylor Coleridge Poet, 1772
- Sasha Roiz Actor, 1973
- Stan Musial Athlete, 1920
- Steve Cropper Musician, 1941
- Steve Lukather Guitarist, 1957
- Tariq Ali Writer, 1943
- Ted Shawn Choreographer, 1891
- Ursula K. Le Guin Writer, 1929
- V. S. Subramanya Iyer Administrator, 1877
- Will Carleton Poet, 1845
- Will Estes Actor, 1978
- William A. Mitchell Chemist, 1911
- William T. Wiley Artist, 1937
- Wolfgang Ketterle Physicist, 1957
- Woodrow M. Kroll Evangelist, 1944
- Zack Greinke Baseball Player, 1983
- Zainab al-Khawaja Activist, 1983