Authors born in 1951
- Juan Manuel Santos Politician, 1951
- Kai Bird Author, 1951
- Karen Allen Film Actor, 1951
- Karen Kain Ballet Dancer, 1951
- Karen Tei Yamashita Writer, 1951
- Karl Eikenberry General Authority, 1951
- Kate Atkinson Screenwriter, 1951
- Kate White Writer, 1951
- Kathleen Parker Columnist, 1951
- Kathleen Troia McFarland Political Commentator, 1951
- Kathryn Bigelow Director, 1951
- Kathryn Gustafson Architect, 1951
- Kathy Smith Trainer, 1951
- Keith B. Alexander Public Servant, 1951
- Keith Wilder Singer, 1951
- Ken Bruen Writer, 1951
- Ken Ham Clergyman, 1951
- Kenneth Chenault Businessman, 1951
- Kenny Dalglish Athlete, 1951
- Kenny Marchant Politician, 1951
- Kerry Bentivolio Politician, 1951
- Kevin Cronin Singer, 1951
- Kevin Keegan Football Player, 1951
- Kevin Whately Actor, 1951
- Kirstie Alley Actress, 1951
- Korky Paul Illustrator, 1951
- Kurt Russell Actor, 1951
- Kurt Schrader Politician, 1951
- Lalla Ward Illustrator, 1951
- Lance Loud Actor, 1951
- Lane Evans Politician, 1951
- Laurie Garrett Author, 1951
- Lee Atwater Politician, 1951
- Leon Black Investor, 1951
- Li Yuanchao Politician, 1951
- Linda Grant Novelist, 1951
- Lou Ferrigno Actor, 1951
- Louise Jameson Actress, 1951
- Louise Rennison Author, 1951
- Luther Vandross Singer, 1951