Authors Born on September 21
- Nicolas Cotugno Priest, 1938
- Nicole Richie Fashion Designer, 1981
- Nicos Poulantzas Sociologist, 1936
- Paulo Costanzo Actor, 1978
- Pramila Jayapal Activist, 1965
- Ren Ng Founder, 1979
- Ricki Lake Actress, 1968
- Ryan Guzman Actor, 1987
- Samantha Power Journalist, 1970
- Sarah Rees Brennan Writer, 1938
- Satpal Maharaj Politician, 1951
- Shinzo Abe Politician, 1954
- Stephen King Author, 1947
- Sunny Murray Drummer, 1936
- Wale Musician, 1984
- Walter Breuning Railroad Executive, 1896
- Yamaga Soko Philosopher, 1622