- Kahlil Gibran
- Kamand Kojouri
- Karen Blixen
- Karen Chandler
- Karen Crockett
- Karen Elizabeth Gordon
- Karen Horney
- Karen Marie Moning
- Karen Salmansohn
- Karen Sunde
- Karl Barth
- Karl Kraus
- Karl Popper
- Karol Newlin
- Katharine Butler Hathaway
- Katharine Graham
- Katharine Hepburn
- Katharine Whitehorn
- Katherine Mansfield
- Katherine Paterson
- Kathleen Norris
- Katie Ford
- Keanu Reeves
- Kelley Armstrong
- Ken Blanchard
- Ken Keyes Jr.
- Kenneth Hildebrand
- Kenny Rogers
- Keri Russell
- Kerry Wendell Thornley
- Kevin Ngo
- Kevin Spacey
- Kim Castle
- Kin Hubbard
- King Edward VIII
- Knute Rockne
- Konrad Adenauer
- Konrad Lorenz
- Konstantin Tsiolkovsky
- Kurt Lewin
- Kurt von Hammerstein-Equord
- Kurt Vonnegut
- Kyle Chandler