Authors born in 1973
- Jamie Sives Actor, 1973
- Jane Lauder Heir, 1973
- Jane March Actress, 1973
- Jason Aaron Comics Writer, 1973
- Jason Behr Actor, 1973
- Jason David Frank Actor, 1973
- Jason Jones Actor, 1973
- Jason Kidd Basketball Player, 1973
- Jason Molina Musician, 1973
- Jason White Musician, 1973
- Jay Duplass Film Director, 1973
- Jay Kristoff Author, 1973
- Jennifer Esposito Actress, 1973
- Jenny Lawson Journalist, 1973
- Jenny Scheinman Violinist, 1973
- Jerry Rivera Singer, 1973
- Jillian Bach Actress, 1973
- Jim Parsons Actor, 1973
- Jimmy Chin Rock Climber, 1973
- Jitin Prasada Politician, 1973
- Joe Goddard Musician, 1973
- Joe Wurzelbacher Activist, 1973
- John Avlon Journalist, 1973
- John Dolmayan Musician, 1973
- John Gruber Writer, 1973
- John Lutz Actor, 1973
- John Mitchell Musician, 1973
- John Moyer Musician, 1973
- John Zimmerman Skater, 1973
- Johnny Damon Baseball Player, 1973
- Jon Evans Novelist, 1973
- Jon Runyan Politician, 1973
- Jordan Bridges Actor, 1973
- Jorge Garcia Actor, 1973
- Josh Homme Singer-Songwriter, 1973
- Juan Diego Florez Vocalist, 1973
- Juan Manuel Marquez Boxer, 1973
- Jussi Lehtisalo Bassist, 1973
- Justin Cathal Geever Guitarist, 1973
- Juwan Howard Basketball Coach, 1973