- Ka'aihue, Kila
- Kaberle, Tomas
- Kaddu, Josh
- Kadri, Nazem
- Kaeding, Nate
- Kaepernick, Colin
- Kafelnikov, Yevgeny
- Kafka, Mike
- Kahne, Kasey
- Kaleta, Patrick
- Kalil, Matt
- Kalil, Ryan
- Kaline, Al
- Kalish, Ryan
- Kaman, Chris
- Kamke, Tobias
- Kampman, Aaron
- Kanada, Craig
- Kane, Evander
- Kane, Lorie
- Kane, Patrick
- Kanepi, Kaia
- Kanter, Enes
- Kapanen, Sami
- Kapinos, Jeremy
- Kapler, Gabe
- Kapono, Jason
- Karim, Deji
- Kariya, Paul
- Karl, Coby
- Karl, George
- Karlovic, Ivo
- Karlsson, Erik
- Karlsson, Robert
- Karpovtsev, Alexander
- Karros, Eric
- Karsay, Steve
- Karstens, Jeff
- Kasay, John
- Kassian, Matt
- Katayama, Shingo
- Katula, Matt
- Kaufman, Chris
- Kaufman, Napoleon
- Kavcic, Blaz
- Kawasaki, Munenori
- Kaye, Jonathan
- Kaymer, Martin
- Kazmir, Scott
- Keane, Mike
- Kearney, Hannah
- Kearns, Austin
- Kearse, Jevon
- Keefe, Adam
- Keefe, Tim
- Keeler, Willie
- Keenum, Case
- Kehl, Bryan
- Keisel, Brett
- Keiser, Thomas
- Keisler, Randy
- Keith, Brandon
- Keith, Duncan
- Keith, Dustin
- Kelce, Jason
- Kelemete, Senio
- Kell, George
- Kelleher, Robert
- Keller, Dustin
- Keller, Jason
- Kelley, Braxton
- Kelley, Joe
- Kelley, Kyle
- Kelley, Shawn
- Kelley, Tony
- Kelly, Ben
- Kelly, Brian
- Kelly, Chris
- Kelly, Dennis
- Kelly, Don
- Kelly, George
- Kelly, Jeff
- Kelly, Jerry
- Kelly, King
- Kelly, Leroy
- Kelly, Lewis
- Kelly, Malcolm
- Kelly, Owen
- Kelly, Reggie
- Kelly, Shawn
- Kelly, Steve
- Kelly, Tommy
- Kelsay, Chris
- Kemoeatu, Chris
- Kemp, Matt
- Kemp, Shawn
- Kendall, Jason
- Kendall, Pete
- Kendall, Skip
- Kendrick, Howie
- Kendrick, Kyle
- Kendricks, Lance
- Kendricks, Mychal
- Kennedy, Adam
- Kennedy, Alex
- Kennedy, Bill
- Kennedy, Ian
- Kennedy, Jimmy
- Kennedy, Joe
- Kennedy, Kenoy
- Kennedy, Lincoln
- Kennedy, Tyler
- Kenney, Cameron
- Kennington, D.J.
- Kennison, Eddie
- Kenseth, Matt
- Kent, Jeff
- Keothavong, Anne
- Keppinger, Jeff
- Kerber, Angelique
- Kerley, Jeremy
- Kern, Brett
- Kerney, Patrick
- Kerr, Cristie
- Kerr, Steve
- Kerrigan, Ryan
- Kershaw, Clayton
- Keselowski, Brad
- Keselowski, Brian
- Kesler, Ryan
- Kessel, Phil
- Kestner, Darrell
- Kettani, Eric
- Keys, Scott
- Khabibulin, Nikolai
- Khudobin, Anton
- Kidd, Jason
- Kidd-Gilchrist, Michael
- Kiefer, Nicolas
- Kieschnick, Brooks
- Kiesling, Walt
- Kile, Darryl
- Kile, Mikey
- Kilgore, Daniel
- Killebrew, Harmon
- Kim, Anthony
- Kim, Byung Hyun
- Kim, Mi Hyun
- Kim, Sun Woo
- Kimball, Cole
- Kimbrel, Craig
- Kindl, Jakub
- Kindle, Sergio
- Kiner, Ralph
- King, Betsy
- King, Billy
- King, Brandon
- King, Brian
- King, D.J.
- King, Derek
- King, Dwight
- King, Eric
- King, Jarriel
- King, Jeff
- King, Justin
- King, Ray
- King, Shaun
- King, Shawn
- King, Stacey
- King, Vania
- Kingston, James
- Kinkaid, Keith
- Kinney, Erron
- Kinsler, Ian
- Kintzler, Brandon
- Kipnis, Jason
- Kiprusoff, Miikka
- Kirby, Charles
- Kirby, Terry
- Kirilenko, Andrei
- Kirilenko, Maria
- Kirk, Chris
- Kirkland, Levon
- Kirkman, Michael
- Kirkpatrick, Dre
- Kirschke, Travis
- Kite, Tom
- Kitna, Jon
- Kittles, Kerry
- Kiwanuka, Mathias
- Klatt, Trent
- Klee, Ken
- Klein, Chris
- Klein, Chuck
- Klein, Emilee
- Klein, Kevin
- Kleiza, Linas
- Klem, Bill
- Klemm, Adrian
- Klemm, Jon
- Klesko, Ryan
- Klesla, Rostislav
- Kleybanova, Alisa
- Kligerman, Parker
- Kline, Steve
- Klinkhammer, Rob
- Klitschko, Vitali
- Kloden, Andreas
- Kloucek, Tomas
- Klug, Karl
- Kluwe, Chris
- Knight, Brandon
- Knight, Brevin
- Knight, Marcus
- Knight, Roger
- Knight, Sammy
- Knight, Tom
- Knight, Travis
- Knighton, Terrance
- Knoblauch, Chuck
- Knorr, Randy
- Knox, Johnny
- Knuble, Mike
- Koch, Billy
- Koch, Blake
- Koch, Carin
- Koch, Gary
- Koch, Sam
- Kodes, Jan
- Kohlschreiber, Philipp
- Kohn, Michael
- Koivu, Mikko
- Koivu, Saku
- Kolb, Kevin
- Kolobnev, Alexandr
- Kolzig, Olaf
- Komar, Max
- Komatsu, Erik
- Konerko, Paul
- Konopka, Zenon
- Konrad, Rob
- Kontiola, Petri
- Konz, Jameson
- Konz, Peter
- Kooistra, Scott
- Kopecky, Tomas
- Kopitar, Anze
- Koppen, Dan
- Korolev, Evgeny
- Korolev, Igor
- Korpikoski, Lauri
- Korver, Kyle
- Kosier, Kyle
- Koskie, Corey
- Kostitsyn, Andrei
- Kostitsyn, Sergei
- Kostka, Mike
- Kostopoulos, Tom
- Kotchman, Casey
- Kotsay, Mark
- Kottaras, George
- Koufax, Sandy
- Koufos, Kosta
- Kournikova, Anna
- Koutouvides, Niko
- Kouzmanoff, Kevin
- Kovalchuk, Ilya
- Kovalenko, Dema
- Kovalev, Alexei
- Kozlov, Viktor
- Kozlowski, Brian
- Kraft, Greg
- Krajicek, Richard
- Kramer, David
- Kramer, Jack
- Kramer, Sven
- Kratz, Erik
- Kratzert, Bill
- Krause, Paul
- Kreider, Dan
- Kreis, Jason
- Krejci, David
- Kresge, Cliff
- Kreuter, Chad
- Kreutz, Olin
- Kreuziger, Roman
- Krieger, Ali
- Kristoff, Alexander
- Krog, Jason
- Kronwall, Niklas
- Kropog, Troy
- Krstic, Nenad
- Kruger, Marcus
- Kruger, Paul
- Kruse, Paul
- Krzyzewski, Mike
- Kuba, Filip
- Kubel, Jason
- Kubiak, Gary
- Kubina, Pavel
- Kubot, Lukasz
- Kucera, Frantisek
- Kuchar, Matt
- Kudryavtseva, Alla
- Kuechly, Luke
- Kuehne, Hank
- Kuehne, Kelli
- Kuerten, Gustavo
- Kuester, John
- Kuhn, John
- Kuhn, Markus
- Kukoc, Toni
- Kukushkin, Mikhail
- Kulemin, Nikolai
- Kulikov, Dmitry
- Kumaritashvili, Nodar
- Kunitsyn, Igor
- Kunitz, Chris
- Kuo, Hong-Chih
- Kupchak, Mitch
- Kuper, Chris
- Kuroda, Hiroki
- Kuznetsova, Svetlana
- Kvapil, Travis
- Kvitova, Petra
- Kyle, Jason