Authors Born on January 21
- Adolphe Monod Churchman, 1802
- Al Barr Singer, 1962
- Al Siebert Author, 1934
- Alex McLeish Football Manager, 1959
- Alexander Klopping Businessman, 1987
- Alexander Weinstein Mathematician, 1897
- Amy Hastings Athlete, 1984
- Andy Coulson Journalist, 1968
- Ashton Eaton Athlete, 1988
- Benny Hill Actor, 1924
- Bill Stein Baseball Player, 1947
- Billy Ocean Singer, 1950
- Booboo Stewart Actor, 1994
- Bozoma Saint John Businesswoman, 1977
- Brian O'Driscoll Rugby Union Player, 1979
- Cat Power Singer-Songwriter, 1972
- Charles V of France King, 1338
- Charlotte Ross Actress, 1968
- Chris Kilmore Musician, 1973
- Christian Dior Fashion Designer, 1905
- Christina Maslach Psychologist, 1946
- Craig A. Evans Writer, 1952
- Craig Roberts Actor, 1991
- Cristobal Balenciaga Fashion Designer, 1895
- Dan Gronkowski American Football Player, 1985
- Dan Pallotta Businessperson, 1961
- Dany Heatley Ice Hockey Player, 1981
- David Eugene Smith Mathematician, 1860
- Donna Lynne Champlin Actress, 1971
- Edwin Starr Musician, 1942
- Egon Friedell Philosopher, 1878
- Elie Tahari Designer, 1952
- Eliza R. Snow Poet, 1804
- Emma Bunton Singer, 1976
- Eric Holder Public Servant, 1951
- Ernest Holmes Theologian, 1887
- Errol Barrow Politician, 1920
- Ethan Allen Farmer, 1738
- Eva Ibbotson Writer, 1925
- Gary Locke Diplomat, 1950