Authors Born on June 21
- Matthew Simpson Bishop, 1811
- Maurice Saatchi Businessman, 1946
- Max Schneider Singer, 1992
- Meredith Baxter Actress, 1947
- Michael Gross Actor, 1947
- Michel Platini Football Player, 1955
- Michelle Wolf Comedian, 1985
- Mike Einziger Musician, 1976
- Olen Steinhauer Novelist, 1970
- Pierre Omidyar Businessman, 1967
- Pontus Hulten Educator, 1924
- Prince William Royalty, 1982
- Ray Davies Vocalist, 1944
- Rebecca Black Youtuber, 1997
- Reinhold Niebuhr Theologian, 1892
- Richard Jefferson Basketball Player, 1980
- Sergey Sobyanin Mayor, 1958
- Tirumalai Krishnamacharya Venkata Desikachar Teacher, 1938
- Tony Scott Film Director, 1944
- Wendy E. Long Lawyer, 1960
- Will C. Barnes Military , 1858
- William Edmondstoune Aytoun Poet, 1813
- William G. Kline American Football Manager, 1882
- William Greenough Thayer Shedd Theologian, 1820
- William Martin Philosopher, 1772
- William Vickrey Professor, 1914
- Yang Liwei Astronaut, 1965
- Yingluck Shinawatra Politician, 1967