text: Brian Girard James – TNA professional wrestler
  Bill Janklow – Governor of South Dakota, U.S. Congressman (R-SD)
  Jamey Johnson – Grammy Award-nominated country music artist
  Howard Johnson – American football player for the Green Bay Packers
  George Jones – Grammy Award-winning country music artist
  K
  Robert A. Katz – Oscar-nominated film producer (Gettysburg, Selena, Introducing Dorothy Dandridge)
  Bob Keeshan  – Captain Kangaroo, original Clarabell the Clown on Howdy Doody
  Harvey Keitel – Oscar-nominated actor (Reservoir Dogs, Pulp Fiction)
  Brian Keith – actor (The Parent Trap)
  Greg Kelly – Fox News broadcast journalist, news reporter and accused rapist
  John F. Kelly – United States Secretary of Homeland Security
  Raymond W. Kelly – police commissioner of the City of New York
  Skip Kenney – U.S. Men's Olympic Swim Coach, Head Swim Coach at Stanford University
  Robert Kiyosaki – motivational speaker, author of Rich Dad, Poor Dad
  Russell Klika – U.S. military combat photographer, photojournalist, author of Iraq: Through the Eyes of an American Soldier
  Ron Kovic – Oscar-nominated author and screenwriter (Born on the Fourth of July and its subsequent film adaptation directed by Oliver Stone)
  Ted Kulongoski – Governor of Oregon
  Bill Kurtis – Emmy Award-nominated television journalist, producer, narrator and news anchor