Authors born in 1970
- Joe Lo Truglio Actor, 1970
- Joel Hoekstra Guitarist, 1970
- John Anthony Frusciante Guitarist, 1970
- John Carmack Programmer, 1970
- John Carter Cash Singer-Songwriter, 1970
- John Frusciante Guitarist, 1970
- John Hamburg Screenwriter, 1970
- John Simm Actor, 1970
- Johnny Messner Actor, 1970
- Johnny Vegas Actor, 1970
- Jon Seda Actor, 1970
- Jonathan Mannion Photographer, 1970
- Jonathan Stroud Writer, 1970
- Jonathan Tropper Writer, 1970
- Joni Ernst Politician, 1970
- Jordan Knight Singer-Songwriter, 1970
- Joseph Fiennes Actor, 1970
- Josh Hopkins Actor, 1970
- Josh Todd Musician, 1970
- Josie Bissett Actress, 1970
- Kaja Foglio Artist, 1970
- Kamaal Ibn John Fareed Rapper, 1970
- Kara DioGuardi Musician, 1970
- Kari Matchett Actress, 1970
- Katie Jacobs Stanton Businesswoman, 1970
- Keisha Lance Bottoms Politician, 1970
- Keith Coogan Actor, 1970
- Kelli Williams Actress, 1970
- Kelly Ripa Actress, 1970
- Kelly Sue DeConnick Editor, 1970
- Ken Leung Actor, 1970
- Kevin Smith Film Maker, 1970
- Kevin Sussman Actor, 1970
- Kevin Warsh Financier, 1970
- Kevin Weisman Film Actor, 1970
- Kevin Young Poet, 1970
- Kirk Cameron Actor, 1970
- Kirk Franklin Musician, 1970
- Kirsten Nelson Actress, 1970
- Klayton Albert Multi-Instrumentalist, 1970