Authors Born on January 1
- Ouida Writer, 1839
- P. N. Elrod Writer, 1954
- Pam Brown Writer, 1948
- Pam Jenoff Author, 1950
- Pamela Dean Author, 1953
- Pankaj Mishra Author, 1969
- Parker Palmer Theologian, 1939
- Patricia Briggs Writer, 1965
- Patrick Lencioni Writer, 1965
- Patrick Pichette Businessperson, 1953
- Paul Buchheit Engineer, 1977
- Periander Leader, 700
- Peter Barris Businessman, 1952
- Peter York Journalist, 1943
- Philip Schaff Theologian, 1819
- Philippa Boyens Screenwriter, 2000
- Phoebe Philo Designer, 1973
- Pierre de Coubertin Leader, 1863
- Quiara Alegria Hudes Playwright, 1977
- Quintilian Educationalist, 35
- Rachel Kushner Writer, 1968
- Rae Carson Novelist, 1973
- Rahman Baba Poet, 1632
- Ralph Allen Philanthropist, 1693
- Ralph Chaplin Songwriter, 1887
- Ralph Cudworth Philosopher, 1617
- Ralph Thomas Walker Architect, 1889
- Ram Shriram Businessperson, 1950
- Ramez Naam Engineer, 2000
- Randy Wayne White Writer, 1950
- Raney Aronson-Rath Producer, 1953
- Reem Acra Designer, 2000
- Richard Edson Actor, 1954
- Richard V. Allen Advisor, 1936
- Richie Faulkner Musician, 1980
- Roger Rocha Songwriter, 2000
- S. J. Rozan Writer, 1950
- Saint Blaise Physician, 300
- Saint Patrick Cleric, 385
- Salar Kamangar Businessman, 1977