- János Sugár
- Jøran Kokvold
- Jānis Kauss
- Jānis Pāvulāns
- Jérôme Inzerillo
- Jørgen Foss
- J.B. Gaynor
- J.D. Wilson
- J.P. Alanis
- J.R. Villarreal
- Jacinta Wawatai
- Jack Bagley
- Jack Cooper
- Jack Cork
- Jack Flynn
- Jack Henry Robbins
- Jack Leary
- Jack McKillop
- Jack McMullen
- Jack Montgomery
- Jack Salvatore Jr.
- Jack Schouten
- Jack Stanley
- Jack Taylor (child actor)
- Jackie Rice
- Jacob Davich
- Jacob Davis
- Jacob DeHaven
- Jacob Dunn
- Jacob Iorio
- Jacob Joseph Worton
- Jacob Kafka
- Jacob Kraemer
- Jacob Nelson
- Jacob Smith
- Jacob Smith (actor)
- Jacob Wasserman
- Jacquelynn Pointer
- Jade Barbosa
- Jae-hong Ahn
- Jaime Krsto
- Jake Burbage
- Jake Lloyd
- Jake Strickland
- Jake Thomas
- Jake Weary
- Jakob Johansson
- Jakub Jesionkowski
- James Banks
- James Berrett
- James Bond Singh
- James Bulger
- James Chichester, Earl of Belfast
- James Faulkner (cricketer)
- James Francis Kelly III
- James Garfunkel
- James Goodman
- James Harris (cricketer)
- James Henry (footballer)
- James Holland (footballer)
- James Iles
- James Livingston (ice hockey)
- James Lomas
- James Martin
- James Martin (actor)
- James McCarthy (footballer)
- James Merryman
- James Ordish
- James Paputsis
- James Paul Roeske II
- James Peter Gale
- James Stankunas
- James Tomkins (footballer)
- James vanRiemsdyk
- Jamie Anderson
- Jamie Green (footballer)
- Jamie Johnston
- Jamie Laird
- Jamie Lynn Spears
- Jamie Stevens (footballer)
- Jamie Waylett
- Jan Hable
- Jan Rehák
- Jana Bieger
- Jana Duggar
- Janelle Corlass-Brown
- Janic Halioua
- Janina Stopper
- Janine Doyon
- Jannis Niewöhner
- Jareb Dauplaise
- Jared Dorrance
- Jared Lilly
- Jared Staal
- Jarred Blakiston
- Jarret Egan
- Jarrett Lee
- Jarron Vosburg
- Jascha Washington
- Jasmine Martin
- Jasmine Richards
- Jasmine Sky
- Jasmine Snäll Vasquez
- Jason Beardsley
- Jason Dolley
- Jason Lester
- Jason Naidovski
- Jason Westlake
- Jason Wise
- Jasper Bel
- Jasper Oldenhof
- Javier Fernandez
- Javier González
- Javier González Sánchez
- Javier Lopez
- Javier Raya
- Javon Ferguson
- Jay Asforis
- Jay Burdi
- Jay Greenberg
- Jaydee Bixby
- Jayson Wheatley
- Jazeman Jaafar
- Jazz Raycole
- Jean-Baptiste Maunier
- Jean-Luc Bilodeau
- Jean-Luke Figueroa
- Jeanne Allen
- Jeferson Douglas dos Santos Batista
- Jeff Sutton
- Jefferson Zelma
- Jeffrey Barbeau
- Jeffrey Davies
- Jeffrey Earnhardt
- Jeffrey Quittman
- Jeffrey Schoeny
- Jeffrey Weedon
- Jelena Kratz
- Jelena Zec
- Jem Karacan
- Jenna Syken
- Jennette McCurdy
- Jenni Vähämaa
- Jennica Garcia
- Jennie Garland
- Jennifer Berhaut
- Jennifer Gayda
- Jennifer Geiger
- Jennifer Harris
- Jennifer Lawrence
- Jennifer Melander
- Jennifer Pike
- Jennifer Veal
- Jenny Di Gennaro
- Jenny-Lynn Hutcheson
- Jens Rogeman
- Jerahl Hughes
- Jeremy Bergman
- Jeremy Cushman
- Jeremy Mockridge
- Jeremy Pied
- Jeremy Roloff
- Jeremy Snider
- Jeremy Suarez
- Jeremy Sumpter
- Jeremy Ten
- Jerib Kaiser
- Jermaine Crawford
- Jeroen van den Broeck
- Jerome Beidler
- Jerome Dargan
- Jerome Pulley
- Jesús Zavala
- Jesús Zavala
- Jesper Adefelt
- Jessa Duggar
- Jesse Camacho
- Jesse Giuliani
- Jesse James
- Jesse James Rutherford
- Jesse Sinopoli
- Jessica D. Stone
- Jessica Gaona
- Jessica Gist
- Jessica Gunnarson
- Jessica Houston
- Jessica Jann
- Jessica Long
- Jessica Mann
- Jessica Marina
- Jessica Mauboy
- Jessica Minor
- Jessica Ritchie
- Jessica Robillard
- Jessica Sara
- Jessica Sumpter
- Jessica Valentino
- Jessica Williams
- Jesus Montero
- Jesus Zavala
- Jett Travolta
- Jewel Mische
- Jewel Restaneo
- Jiana Webb
- Jibbs
- Jill Duggar
- Jill Shackner
- Jill Yulo
- Jillian Berard
- Jillian Bull
- Jillian Marie
- Jillian Wheeler
- Jim O'Brien (ice hockey)
- Jim van der Panne
- Jimi Ochsenknecht
- Jimmy Evans
- Jiro Manio
- João Pedro Silva
- João Prim
- João Secundino
- Joahnn Yamazaki
- Joakim Andersson
- Joakim Harestad Haukaas
- Joana de Verona
- Joana Pinhão Botelho
- Joann Yamazaki
- Joanna 'JoJo' Levesque
- Joanna Dusik
- Joanna Eichhorn
- Joanna HartsHorne
- Joanna Lenko
- Joanna Sulej
- Joe Allen
- Joe Gunn
- Joe Johnson
- Joe Jonas
- Joe Rubin
- Joe Sinopoli
- Joe Skarz
- Joe Thompson
- Joe Wilcox
- Joel Ander
- Joel Ekstrand
- Joel Pitts
- Joel Rust
- Joelle Ludwig
- Joey Gaydos
- Joey Gaydos Jr.
- Joey Logano
- Joey Medeiros
- Joey Melo
- Joey Page
- Joey Pearson
- Joey Shea
- Johan Cuny
- Johan Erkgärds
- Johan Falkesäter
- Johan Motin
- Johanna Velasquez
- Johanna Wessner
- Johannes Braun
- Johannes Halbig
- Johannes Pirkebner
- Johannes Scheit
- John Bostock
- John Christopher Allen
- John Fleck (footballer)
- John Herina
- John Irving (footballer)
- John John Florence
- John Lowell
- John Luckett
- John Mountford
- John Negrin
- John Paul Alanis
- John Tavares (ice hockey)
- John Wayne Sace
- John-David Duggar
- Johnny Exantus
- Johnny McKeown
- JoJo (singer)
- Jojo Schöning
- Jolo Revilla
- Jon Johnson
- Jon Jon Geitel
- Jon McEvoy
- Jona Xiao
- Jonah Meyerson
- Jonalyn Viray
- Jonas Holst Schmidt
- Jonas Meukens
- Jonathan Ahdout
- Jonathan Beck
- Jonathan Cháves
- Jonathan Chang
- Jonathan Dümcke
- Jonathan Dixon
- Jonathan dos Santos
- Jonathan Estrada
- Jonathan Eysseric
- Jonathan Fairburn
- Jonathan Feurich
- Jonathan Freudman
- Jonathan Holbert
- Jonathan Lipnicki
- Jonathan Osser
- Jonathan Reis
- Jonathan Thornton
- Jonathan Weisbrod
- Jonathas Cristian de Jesus Maurício
- Jonathon Blum
- Jonathon Porter
- Jonbenet Ramsey
- Jonni Remmler
- Jonny Flint
- Jopaul Epp
- Jordan Burt
- Jordan Calloway
- Jordan David
- Jordan Fox
- Jordan Garrett
- Jordan Hasay
- Jordan Hinson
- Jordan Hunter
- Jordan McCoy
- Jordan Mutch
- Jordan Parkes
- Jordan Pruitt
- Jordan Puryear
- Jordan Ranft
- Jordan Rhodes
- Jordan Smith
- Jordan Theis
- Jordan Valacich
- Jordan Walker Ross
- Jordan-Claire Green
- Jordann Beal
- Jordin Sparks
- Jordon Dorrance
- Jorge Flores (soccer)
- Jorge Ruiz
- Jorge Trejo
- Jorik Prins
- José Zito
- Joséphine Berry
- José Cláudio Carvalho da Silva
- Jose Manuel Vargas
- Josef Mattes
- Josefina Vilsmaier
- Josefine Hansen
- Josefine Nytofte
- Joseph Aston
- Joseph Barrett
- Joseph Marrese
- Joseph Mattock
- Joseph McManners
- Joseph Moore
- Joseph Sasson
- Joseph Saul
- Joseph Tello
- Joseph Tremain
- Joseph Vincent Cordaro
- Joseph W. Dixon Jr.
- Joseph Zita
- Josepha Niebelschütz
- Josh Auty
- Josh Blaylock
- Josh Hayden
- Josh Hill
- Josh Hutcherson
- Josh Lackman
- Josh Shada
- Josh Walker
- Josh Wright (footballer)
- Joshua Brail
- Joshua Croughwell
- Joshua Miller
- Joshua Suherman
- Joshua Titen
- Jovan Damjanovic
- Jovan Kampbell
- Joy Lauren
- Joy Stenwald
- Jozy Altidore
- Juan Carlos Estrada
- Juan Pablo Martínez Irtia
- Juan Pedro Lanzani
- Judd Trump
- Jules Sitruk
- Julia Bridgeman
- Julia Charlotte Geitvik
- Julia Cohen
- Julia Glushko
- Julia Kristin Pittasch
- Julia Krombach
- Julia Pritchard
- Julia Sinks
- Julia Szczerbowska
- Julia Urbán
- Julia Vlassov
- Julia Zlobina
- Julian Blaustein Rejto
- Julian Brewster
- Julian Ciais
- Julian Griffith
- Julian Michael Caiazzo
- Julian Snider
- Julian Spatz
- Julian Thome
- Julian Weber
- Juliana Cannarozzo
- Juliana Lohmann
- Julianna Rose Mauriello
- Julianne Côté
- Julie Dubela
- Julie Gould
- Julie Grundtvig
- Julie Grundtvig Wester