K
- "K-Rod" = Francisco Rodríguez, Venezuelan closer
- "Kelly" = Tommy Holmes, United States baseball player
- "The Kid" =
- Gary Carter American catcher
- Ken Griffey, Jr., American center fielder
- Ted Williams, American left fielder
- "Kiki" = Hazen Shirley Cuyler, United States baseball player
- "Killer B's" = nickname given to a group of Houston Astros players, such as Jeff Bagwell, Craig Biggio, Derek Bell, and Lance Berkman
- "King" = Mike Kelly, United States baseball player
- "King Felix" = Félix Hernández, Venezuelan baseball player
- "King Kong" = Charlie Keller, American born outfielder.
- "Kitty" = Jim Kaat, American starting pitcher
- "Kung Fu Panda" = Pablo Sandoval, Venezuelan first basemen
Read more about this topic: List Of Baseball Player Nicknames