Authors Born on January 21
- Geena Davis Actress, 1956
- Gene Sharp Professor, 1928
- George Gillespie Theologian, 1613
- Hakeem Olajuwon Basketball Player, 1963
- Hasso Plattner Businessman, 1944
- Israel Zangwill Novelist, 1864
- Jack Henry Abbott Author, 1944
- Jack Nicklaus Golfer, 1940
- Jackson Brundage Actor, 2001
- Jam Master Jay Musician, 1965
- James Larkin Socialist, 1876
- Jason Moran Pianist, 1975
- Jeff Koons Artist, 1955
- Jeremy Shada Actor, 1997
- Jerry Trainor Actor, 1977
- Karina Lombard Film Actor, 1969
- Karl Wallenda Artist, 1905
- Kazuo Inamori Philanthropist, 1932
- Ken Leung Actor, 1970
- Kevin Cramer Politician, 1961
- Kim Dotcom Entrepreneur, 1974
- Laura Robson Tennis Player, 1994
- Luke Grimes Actor, 1984
- Lynn Schusterman Philanthropist, 1939
- M. K. Hobson Writer, 1969
- Mac Davis Musician, 1942
- Marie Trintignant Actress, 1962
- Matt Salmon Politician, 1958
- Matt Willig Actor, 1969
- Michael Wincott Actor, 1958
- Mike Medavoy Film Producer, 1941
- Neil McDonald Chess Player, 1967
- Nicholas Wolterstorff Philosopher, 1932
- Oren Peli Film Director, 1970
- Paul Allen Businessman, 1953
- Paul Scofield Actor, 1922
- Phil Thompson Football Manager, 1954
- Placido Domingo Musician, 1941
- Richie Havens Singer-Songwriter, 1941
- Robert Weston Smith Disc Jockey, 1938