Authors Born on January 1
- Hanna Rosin Writer, 1970
- Hannah Kent Writer, 1985
- Hanoi Hannah Radio Personality, 1931
- Hans-Ulrich Obrist Curator, 1968
- Hari Kunzru Journalist, 1969
- Harriet Tubman Writer, 1820
- Ian Foster Scientist, 1959
- Ian Hickson Author, 1953
- Ira Glasser Activist, 1938
- Isaac Goldberg Author, 1887
- Ivan Krastev Public Servant, 1965
- Ivica Dacic Politician, 1966
- J. A. Konrath Science Fiction Writer, 1970
- J. D. Salinger Writer, 1919
- J. Edgar Hoover Military Officer, 1895
- J. Maarten Troost Author, 1969
- Jackie Tabick Rabbi, 1948
- Jacky Ickx Formula One Driver, 1945
- Jaiprakash Gaur Entrepreneur, 1930
- James G. Frazer Anthropologist, 1854
- James Lassiter Film Producer, 1953
- James Sinegal Businessman, 1936
- Jamshyd Godrej Businessman, 1949
- Jason Gann Actor, 1971
- Jason Pierre-Paul American Football Player, 1989
- Jeff Moss Programmer, 1975
- Jeffrey Bell Writer, 1953
- Jeffrey Klarik Writer, 2000
- Jennifer Hale Voice Actor, 1972
- Jerry Robinson Comics Writer, 1922
- Jessica Bird Novelist, 1969
- Joe Orton Playwright, 1933
- Joe Tsai Founder, 1964
- John Foxe Historian, 1516
- John Fuller Poet, 1937
- John Fusco Screenwriter, 2000
- John G. D. Clark Historian, 1915
- John Henrik Clarke Historian, 1915
- John Twelve Hawks Author, 2000
- Jon Corzine Financier, 1947