- mid 5
- John McGinlay
- John McGraw
- John McKissick
- John McNally
- John Moncur
- John Montgomery Ward
- John Morgan (sailor)
- John Nelson (swimmer)
- John Pearson (footballer)
- John Quinn (footballer)
- John Rinka
- John Roberts, Jr. (billiards player)
- John Shaw (sailor)
- John Shuster
- John Sillett
- John Skladany
- John Smoltz
- John Spellman (wrestler)
- John Symank
- John Talbut
- John Townrow
- John Treacy
- John Utaka
- John Veitch (footballer)
- John Wark
- John Wylie (footballer)
- Johnny Bailey (American football)
- Johnny Baker
- Johnny Bower
- Johnny Bright
- Johnny Brooks
- Johnny Duncan (footballer)
- Johnny Evers
- Johnny Giles
- Johnny Herbert
- Johnny Lattner
- Johnny Lujack
- Johnny Mack Brown
- Johnny Majors
- Johnny Oates
- Johnny Pesky
- Johnny Wheeler
- Jon Arnett
- Jon Crispin
- Jon Knudsen
- Jon Newsome
- Jon Sieben
- Jonas Olsson (footballer born 1983)
- Jonas Wallerstedt
- Jonathan Fortune
- Jonathan Musgrave
- Jonathan Woodgate
- Jonny Moseley
- Jordi Calafat
- Jörg Stübner
- Jorge de Paiva
- Jörgen Mårtensson
- Jørgen Rostrup
- Jörgen Sundelin
- Jorunn Teigen
- José Augusto de Almeida
- Jose Baxter
- José Beyaert
- Jose Canseco
- José Carlos Araújo Nunes
- José Doreste
- José Luis Chilavert
- José Manuel Ochotorena
- Jose Parica
- José Samyn
- Joseba Etxeberria
- Josef Rieder
- Josef Stalder
- Josef Walter
- Josef Wilhelm
- Joseph-Désiré Job
- Joseph De Craecker
- Joseph Hermans
- Joseph M. Papp
- Joseph Peroteaux
- Joseph Rosemeyer
- Joseph Welzenbacher
- Josh Beckett
- Josh Cody
- Josh Garbutt
- Josh Gibson
- Josh Hamilton (baseball)
- Josh Thompson (footballer)
- Jostein Grindhaug
- Jozef Sabovčík
- József Kiprich
- József Rády
- Juan Andres Larré
- Juan Antonio Samaranch
- Juan Carlos Menseguez
- Juan Holgado
- Juan Marichal
- Juárez de Souza Teixeira
- Judit Temes
- Juhani Järvinen
- Juhani Salmenkylä
- Jules Dewaquez
- Julia Novikova
- Julian Dicks
- Juliano Belletti
- Julie Skinner
- Julien Faubert
- Júlio Baptista
- Julio César Chávez
- Julio Franco
- Julio Sieburger
- Julius Aghahowa
- Julius Peppers
- Jung Jae-Eun
- Jupp Derwall
- Jürg Röthlisberger
- Jürgen Macho
- Jürgen Röber
- Jurgen Van de Walle
- Jury Chechi
- Jussi Jääskeläinen
- Jussi Veikkanen
- Just Fontaine
- Justin Gatlin
- Jutta Behrendt
- Jyrki Järvi
- Kaarlo Mäkinen
- Kajsa Nilsson
- Kalle Anttila
- Kalle Dalin
- Kamel Ghilas
- Kapil Dev
- Karen Corr
- Karen Fonteyne
- Karen Harup
- Karen Stives
- Kari Sallinen
- Kari Traa
- Karim Benzema
- Karl Frei
- Karl Johansson
- Karl John
- Kasey Kahne
- Kasia Kulesza
- Katalin Szőke
- Katarina Allberg
- Katarina Borg
- Kate Smith
- Kateřina Němcová
- Kathleen Ellis
- Katja Nyberg
- Katja Seizinger
- Kay Stephenson
- Kazuyoshi Miura
- Kees Zwamborn
- Keiji Tamada
- Keiran Agard
- Keisuke Honda
- Keith Andrews (footballer)
- Keith Curle
- Keith Fletcher
- Keith Gretzky
- Keith Hernandez
- Keith Jackson
- Keith Jackson (tight end)
- Keith Miller
- Keith R. Tribble
- Keiwan Ratliff
- Kelley Law
- Kelly Bechard
- Kelly Clark
- Kelly Holmes
- Kelly Kryczka
- Kelly Rulon
- Kelpo Gröndahl
- Ken Caminiti
- Ken Campbell (footballer)
- Ken Carter
- Ken Dryden
- Ken Forsch
- Ken Gray
- Ken Green (golfer)
- Ken Miller (football coach)
- Ken Rosewall
- Ken Tralnberg
- Ken Willingham
- Kenenisa Bekele
- Kengo Nakamura
- Kenneth Hall (American football)
- Kenneth Sitzberger
- Kenny Bräck
- Kenny George
- Kenny Rogers (baseball)
- Kenny Washington (American football)
- Kent Hill
- Kenyatta Walker
- Keon Daniel
- Kermit Washington
- Kerry Wood
- Kerryn McCann
- Kerstin Granstedt
- Keto Losaberidze
- Kevin Bond (footballer)
- Kevin Brown (right-handed pitcher)
- Kevin Carter (American football)
- Kevin Davies
- Kevin Durant
- Kevin Gallacher
- Kevin Garnett
- Kevin Kelly (announcer)
- Kevin Kyle
- Kevin MacDonald (footballer)
- Kevin Mawae
- Kevin Muscat
- Kevin O'Flanagan
- Kevin O'Sullivan (baseball)
- Kevin Phillips (footballer)
- Kevin Polcovich
- Kevin Sheedy (Australian footballer)
- Kevin Sheedy (Irish footballer)
- Kevin Thomson
- Kevin Youkilis
- Khaled Lounici
- Ki Aldrich
- Ki Mi-Sook
- Kiara Nowlin
- Kid Nichols
- Kieran Donaghy
- Kieron Dyer
- Kiki Cuyler
- Kiki Musampa
- Kiko Sánchez
- Kim Choon-Rye
- Kim Grant (footballer)
- Kim Hammond
- Kim Hwa-Sook
- Kim Jo-Sun
- Kim Kyong-Hun
- Kim Kyung-Soon
- Kim Kyung-Wook
- Kim Mi-Sook
- Kim Myung-Soon
- Kim Ok-Hwa
- Kim Weon-Kee
- Kim Young-Nam
- Kimi Räikkönen
- Kine Hallan Steiwer
- King Kelly
- Kingsley Black
- Kirby Puckett
- Kirk Ferentz
- Kirk Hinrich
- Kirstin Normand
- Kisho Yano
- Kjell Hovda
- Klaus Köste
- Knowlton Ames
- Knute Rockne
- Köbi Kuhn
- Koji Gushiken
- Konrad Frey
- Kostas Chalkias
- Kristian Kuusela
- Kristin Armstrong
- Kristin Bekkevold
- Kristina Šmigun-Vähi
- Kristine Lilly
- Kristine Lunde-Borgersen
- Kristine Roug
- Krzysztof Warzycha
- Ksenia Chernykh
- Kurt Nielsen
- Kurt Seiffert
- Kustaa Pihlajamäki
- Kwame Quansah
- Kyle Busch
- Kyösti Luukko
- Kyriaki Liosi
- L. C. Greenwood
- LaDainian Tomlinson
- Ladislav Vácha
- Lamia Bahnasawy
- Lance Larson
- Larry Brinson
- Larry Brown (basketball)
- Larry Hughes
- Larry Jackson
- Larry Johnson (basketball, born 1969)
- Larry Morris
- Larry Wilson
- Lars Bjønness
- Lars Hall
- Lars Skjeset
- Lassana Diarra
- Lasse Schøne
- László Berti
- László Fábián (pentathlete)
- László Széchy
- Laura Alicia Brown
- Laura Badea
- Laura Robson
- Lauren Burns
- Laurence Leboucher
- Laurie Rinker
- Lawrence Low
- Lawrence McCutcheon
- Lawrence Taylor
- Lazaros Papadopoulos
- Lazarus Kaimbi
- Lazhar Hadj Aïssa
- Leandro Faggin
- Ledley King
- Lee Bowyer
- Lee Cattermole
- Lee Dixon
- Lee Eun-Kyung
- Lee Han-Sup
- Lee Ho-Youn
- Lee Humphrey
- Lee Ki-Soon
- Lee Mi-Young (handballer)
- Lee Roy Jordan
- Lee Roy Selmon
- Lee Sang-Hwa
- Lee Smith (baseball)
- Lee Soon-Ei
- Lee Sun-Hee
- Lee Young-Ja
- Leena Salmenkylä
- Leena Silvennoinen
- Lefty Grove
- Leigh Cooper
- Len Dawson
- Lena Hasselström
- Lennart Viitala
- Lenny Moore
- Leo Durocher
- Léon Huybrechts
- Leon Osman
- Leon Štukelj
- Léon Tom
- Leonard Barry
- Leonard Howell (footballer)
- Leonard Marshall
- LeRoy Butler
- Leroy Rosenior
- Les Ferdinand
- Les Jackson
- Les Miles
- Les Shannon
- Lesley Bush
- Lesley Thompson
- Leslie Balfour-Melville
- Leslie Jones (footballer)
- Lewis Hamilton
- Li Jing (gymnast)
- Li Ning (gymnast)
- Li Xiaoshuang
- Liisa Anttila
- Liisa Veijalainen
- Lilian Nalis
- Lillian Watson (swimmer)
- Lim Mi-Kyung
- Lin Li (swimmer)
- Lina Cheryazova
- Lina Persson
- Linda Gustavson
- Linda Medalen
- Linda Moore
- Linda Verde
- Lindsay Bury
- Lindsey Vonn
- Lindy Infante
- Linn-Kristin Riegelhuth
- Lionel Liottel
- Lisa Alexander
- Lisa Hall
- Lisa Schoeneberg
- Lisandro López
- Lisle Blackbourn
- List of members of the Baseball Hall of Fame
- List of revocations of appointments to orders and awarded decorations and medals of the United Kingdom
- Lito Sheppard
- Liván Hernández
- Llewelyn Kenrick
- Lloyd Langlois
- Lolo Jones
- Lomana LuaLua
- Lomas Brown
- Lorenzo Hampton
- Lorenzo Neal
- Lori Garbacz
- Lorne Loomer
- Lory Meagher
- Lottie Dod
- Lou Boudreau
- Lou Butera
- Lou Carnesecca
- Lou Holtz
- Lou Macari
- Lou Michaels
- Lou Piniella
- Louie Vito
- Louis Van de Perck
- Louise Sauvage
- Lowell North
- Lü Lin
- Luann Ryon
- Lubomir Geraskov
- Ľubomír Moravčík
- Ľuboš Micheľ
- Luc Pillot
- Lucia Rijker
- Lucien Gaudin
- Lucien Michard
- Luděk Macela
- Luigi Cantone
- Luigi Turci
- Luis Aparicio
- Luís Fabiano
- Luis Gonzalez (outfielder)
- Luis Herrera
- Luis Lucchetti
- Luis María Lasúrtegui
- Luiz Bombonato Goulart
- Luiz Felipe Scolari
- Luka Modrić
- Lukas Jutkiewicz
- Lukas Tudor
- Luther Blissett
- Luther Lassiter
- Lyne Beaumont
- Lynn Burke
- Lynn Swann
- Lynne Jewell
- Maarten van Dulm
- Mack Brown
- Magda Horváth
- Magdalena Neuner
- Magdolna Kovács
- Magnus Liljedahl
- Magnus Swartling
- Maicon Douglas Sisenando
- Maik Taylor
- Maja Alm
- Makoto Hasebe
- Mal Aldrich
- Malcolm Beard
- Małgorzata Glinka
- Malky Mackay
- Mame Biram Diouf
- Manfred Schnelldorfer
- Manuel Capela
- Manuel Pellegrini
- Marc-Antoine Fortuné
- Marc Lièvremont
- Marc Perrodon
- Marcel Berré
- Marcela Kubatková
- Marcello Bertinetti
- Marcia Gudereit
- Marcin Wasilewski
- Marco Ambrosio
- Marco Antônio
- Marco Borriello
- Marco Donadel
- Marco Reich
- Marco Streller
- Marcos Baghdatis
- Marcus Allbäck
- Marcus Allen
- Marcus Berg
- Marcus Gayle
- Marcus Thomas (defensive tackle)
- Marek Saganowski
- Margarita Nikolaeva
- Margit Korondi
- Margot Thien
- Margriet Matthijsse
- Margrit Thommen
- Marguerite Norris
- Margunn Haugenes
- Mari Fasting
- Mária Honzová
- Marian Bublewicz
- Marian Davidik
- Marianne Bogestedt
- Marianne Riddervold
- Mariano Rivera
- Marie-Claire Restoux
- Marie-Luce Romanens
- Marie Lindgren
- Marina Kosheveya
- Marinho Chagas
- Mario Ančić
- Mario Been
- Mario Cristobal
- Mário de Noronha
- Mario Domínguez
- Mario Ghella