ایکس فاکتور

• Alketa Vejsiu

• Pandi Laço (1–4)
• Alban Skënderaj (1–4)
• Vesa Luma (1)
• Juliana Pasha (1)
• Altuna Sejdiu (2–3)
• Soni Malaj (2–3)
• Miriam Cani (4)
• Bleona Qereti (4)

• Season 1, 2012: Sheila Haxhiraj
• Season 2, 2012–13: Arilena Ara
• Season 3, 2013–14: Ergi Dini
• Season 4, 2015: Edea Demaliaj

• جوئل رحمه (1–2)
• باسل الزارو (3–4)
• یسرا اللوزی (3)
• دانیلا رحمه (4)

• نیلی کلفیان (1)
• Michel Elefteriades (1–2)
• خالد الشیخ (1–2)
• انوشکا (2)
• کارول سماحه (3)
• الیسا (3–4)
• حسین الجسمی (3)
• وائل کفوری (3)
• راغب عالمه (4)
• دنیا سمیر غانم (4)

• Season 1, 2006: Rajaa Kasabni
• Season 2, 2007: Muhammad El Majzoub
• Season 3, 2013: Mohammed Rifi
• Season 4, 2015: Hamza Hawsawi

•  ارمنستان

• کنونی
• Grisha Aghakhanyan (3–)
• پیشین
• Aram Mp3 (1–2)
• Avet Barseghyan (3)

• کنونی
• Garik Papoyan
• André (2–)
• Erik Karapetyan (4–)
• Shushanik Arevshatyan (4–)
• پیشین
• Egor Glumov (1, 3)
• Naira Gyurjinyan (1–2)
• Gisane Palyan (1–2)
• Emmy (3)

• Season 1, 2010–11: Vrezh Kirakosyan
• Season 2, 2012–13: Kim Grigoryan
• Season 3, 2014: Vahé Margaryan
• Season 4, 2016–17: Edgar Ghandilyan
• Season 5, 2018–19: TBD

• Jason Dundas (8)
• Luke Jacobz (2–7)
• Daniel MacPherson (1)
• Chloe Maxwell (The Xtra Factor,1)
• Natalie Garonzi (The Xtra Factor, 2)

• Guy Sebastian (2–4, 7–8)
• Mel B (3–4, 8)
• / Iggy Azalea (8)
• Adam Lambert (8)
• Dannii Minogue (5–7)
• James Blunt (7)
• Chris Isaak (7)
• Redfoo (5–6)
• Natalie Bassingthwaighte (3–6)
• Ronan Keating (2–6)
• Natalie Imbruglia (2)
• Kyle Sandilands (2)
• Kate Ceberano (1)
• Mark Holden (1)
• John Reid (1)

• Season 1, 2005: Random
• Season 2, 2010: Altiyan Childs
• Season 3, 2011: Reece Mastin
• Season 4, 2012: Samantha Jade
• Season 5, 2013: Dami Im
• Season 6, 2014: / Marlisa Punzalan
• Season 7, 2015: / Cyrus Villanueva
• Season 8, 2016: Isaiah Firebrace

•  بوسنی و هرزگوین
•  کرواسی
•  مقدونیه شمالی
•  مونته‌نگرو
•  صربستان

• Ana Grubin (live shows, 1)
• Bane Jevtić (1, Auditions, backstage, 1)
• Snezana Velkov (1, Auditions, backstage, 1)
• Una Senić ^{(X Star, judges' houses, 1)}
• Antonija Blaće (selection process, live shows, 2)
• Aleksandar Radojičić (selection process, live shows, 2)
• Nikolina Pišek (backstage, 2)

• Željko Joksimović (1–2)
• Emina Jahović (1)
• Kiki Lesendrić (1)
• Kristina Kovač (1)
• Aleksandra Kovač (2)
• Massimo Savić (2)
• Tonči Huljić (2)

• Series 1, 2013–14: Daniel Kajmakoski
• Series 2, 2015: Amel Ćurić

• Hadise (2)
• Koen Wauters (1)

• Kris Wauters (1–2)
• Jean Blaute (1)
• Liliane Saint-Pierre (1)
• Maurice Engelen (2)
• Do (2)

• Season 1, 2005: Udo Mechels
• Season 2, 2008: Dirk De Smet

• Carlos Rocabado
• Ximena Zalzer

• کنونی
• Andrés Barba (1–)
• Mayra Gonzales (1–)
• Matamba (3–)
• / Chris Syler (1–)
• پیشین
• Ángel López (2, 4–)
• Jonathan Moly (1)

• Season 1, 2018: Javier Cortéz
• Season 2, 2018: Juan Lovera
• Season 3, 2019: Upcoming season

• Fernanda Paes Leme (X Factor)
• Maurício Meirelles (Pré-Factor)

• Rick Bonadio
• Alinne Rosa
• Di Ferrero
• Paulo Miklos

• Season 1, 2016: Cristopher Clark

• کنونی
• Maria Ignatova (2–)
• Alexandra Raeva (2–)
• پیشین
• Deo (1)

• Current
• Krisko (4–)
• Sanya Armutlieva (2–)
• Lubo Kirov (2–3, 5–)
• Zaki (2–3, 5–)
• Former
• Maria Ilieva (1–3)
• Poli Genova (1)
• Vasko Vasilev (1)
• Maga (1)
• Lucy Diakovska (4)
• Magarditch Halvadjian (4)

• Season 1, 2011: Raffi Boghosyan
• Season 2, 2013: Zhana Bergendorff
• Season 3, 2014–15: Slavin Slavchev
• Season 4, 2015–16: Christiana Louizu
• Season 5, 2017: 4 Magic

• TBA

• TBA

• Season 1, TBC: Upcoming season

• Julián Elfenbein

• Tito Beltrán
• Karen Doggenweiler
• Mon Laferte (2)
• José Luis Rodríguez (2)
• Zeta Bosio (1)

• Season 1, 2011: Sergio Járlaz
• Season 2, 2012: Juan Gabriel Valenzuela

• Da Zuo (1)
• Shao Wenjie (1)
• Zhu Dan (2)
• He Jiong (2)

• Angie Chai Chih–ping (1)
• Aduo (1)
• Chen Ming (1)
• Chen Yufan (1)
• Eason Chan Yik–shun (2)
• Lo Ta-yu (2)
• Zheng Jun (2)
• Zhang Ziyi (3)

• Season 1, 2011: Li Shangshang
• Season 2, 2012: Chen Yumeng

• Andrea Serna

• Marbelle
• José Gaviria
• Juan Carlos Coronel

• Series 1, 2005: Julio César Meza
• Series 2, 2006: Francisco Villarreal
• Series 3, 2009: Siam

• Series 1, 2006: Luz Amparo Álvarez

• Marbelle
• José Gaviria
• Juan Carlos Coronel (1, 3)
• Wilfrido Vargas (2)

• Season 1, 2006: Andres Camilo Hurtado
• Season 2, 2007: Camilo Echeverry Correa
• Season 3, 2011: Shaira Selena Peláez

• Marbelle
• José Gaviria
• Juan Carlos Coronel
• Reykon

• Season 1, 2015: Dúo Herencia

• Leoš Mareš

• Gabriela Osvaldová
• Ondřej Soukup
• Petr Janda

• Season 1, 2008: Jiří Zonyga

• Martin Rausch

• Celeste Buckingham
• Ondřej Brzobohatý
• Sisa Sklovská
• Oto Klempíŕ

• Season 1, 2014: Peter Bažík

• Current
• Sofie Linde Ingversen (9–)
• Rasmus Brohave (Z Factor, 12–)
• Former
• Eva Harlou (7–8)
• Lise Rønne (1–2, 4–5)
• Signe Muusmann (3)
• Signe Molde (6)
• Emil Thorup (Xtra Factor, 6)
• Thomas Skov (X Factor Backstage, 8)
• Joakim Ingversen (11 from 1st to 2nd live shows)
• Joakim Ingversen (Ultra Factor, 9–11)
• Jacob Riising (Ultra Factor, 11)

• Current
• Thomas Blachman (1–2, 4–)
• Oh Land (12–)
• Ankerstjerne (12–)
• Former
• Lina Rafn (1–2, 7–8)
• Remee (1–3, 7–11)
• Soulshock (3)
• Pernille Rosendahl (3–5)
• Cutfather (4–5)
• Ida Corr (6)
• Anne Linnet (6)
• Mette Lindberg (9–10)
• Sanne Salomonsen (11)

• Season 1, 2008: Martin Hoberg Hedegaard
• Season 2, 2009: Linda Andrews
• Season 3, 2010: Thomas Ring Petersen
• Season 4, 2011: Sarah Skaalum Jørgensen
• Season 5, 2012: Ida Østergaard Madsen
• Season 6, 2013: Chresten Falck Damborg
• Season 7, 2014: Anthony Jasmin
• Season 8, 2015: Emilie Esther
• Season 9, 2016: Embrace
• Season 10, 2017: Morten Nørgaard
• Season 11, 2018: Place on Earth
• Season 12, 2019: Current Series

• Ursula Strenge

• Jorge Luis del Hierro (1)
• Pamela Cortéz (1)
• Maykel Cedeño (1)

• Season 1, 2015: Celena Rosero

• Current
• Ile Uusivuori (2–)
• Viivi Pumpanen (2–)
• Former
• Heikki Paasonen (1)
• Jukka Rossi (Xtra Factor, 1)

• Current
• Michael Monroe (2–)
• Saara Aalto (2–)
• Suvi Teräsniska (2–)
• Mikael Gabriel (2–)
• Former
• Linda Brava (1)
• Renne Korppila (1)
• Gugi Kokljuschkin (1)

• Season 1, 2010: Elias Hämäläinen
• Season 2, 2018: Tika Liljegren
• Season 3, 2019: TBD

•  فرانسه
• Wallonia

• Sandrine Corman (2)
• Jérôme Anthony (F@n Factor, 2)
• Alexandre Devoise (1)

• Henry Padovani (2)
• Olivier Schultheis (2)
• Véronic DiCaire (2)
• Christophe Willem (2)
• Marc Cerrone (1)
• Julie Zenatti (1)
• Alain Lanty (1)

• Season 1, 2009: Sébastien Agius
• Season 2, 2011: Matthew Raymond-Barker

•  گرجستان

• Gega Palavandishvili (1)
• la Sukhitashvili (1)
• Giorgi Kipshidze (2)
• Ruska Makashvili (3–)
• Erekle Getsadze (4)
• Vaniko Tarkhnishvili

• Current
• Stephane Mgebrishvili (1,4–)
• Tamta (1–2, 5–)
• ??? (5–)
• ??? (5–)
• Former
• Giorgi Gabunia (1–4)
• Sopho Toroshelidze (1)
• Sofia Nizharadze (2–4)
• Anri Jokhadze (2)
• Nina Sublatti (3)
• Nika Gvaramia (3)
• Dato Porchkhidze (3)
• Lela Tsurtsumia (4)

• Season 1, 2014: Tornike Kipiani
• Season 2, 2015: Giorgi Nakashidze
• Season 3, 2016: Avto Abeslamidze
• Season 4, 2017: Sandro Lacquer
• Season 5, 2018: Anri Guchmanidze

• Jochen Schropp (1–3)
• Janin Reinhardt (backstage, 2)
• Charlotte Würdig (4)
• Istenes Bence (4)

• Sarah Connor (1–3)
• Till Brönner (1–2)
• George Glueck (1)
• Das Bo (2)
• Sandra Nasic (3)
• HP Baxxter (3)
• Moses Pelham (3)
• Sido (4)
• Lions Head (4)
• Jennifer Rostock (4)
• Thomas Anders (4)

• Season 1, 2010: Edita Abdieski
• Season 2, 2011: David Pfeffer
• Season 3, 2012: Mrs. Greenbird
• Season 4, 2018: EES & The Yes-Ja! Band

• Current
• Despina Vandi (6–)
• Aris Makris (backstage, 6–)
• Former
• Sakis Rouvas (1–5)
• Giorgos Lianos (auditions, 1–3)
• Despina Kampouri (auditions, 1–2)
• Maria Sinatsaki (auditions, 3)
• Evangelia Aravani (backstage, 4–5)

• Current
• Giorgos Theofanous (1–4, 6–)
• Melina Aslanidou (6–)
• Christos Mastoras (6–)
• Michael Tsaousopoulos (6–)
• Former
• George Levendis (1–3)
• Katerina Gagaki (1–3)
• Nikos Mouratidis (1–3)
• Tamta (4–5)
• Peggy Zina (4)
• Thodoris Marantinis (4)
• Giorgos Papadopoulos (5)
• Babis Stokas (5)
• Giorgos Mazonakis (5)

• Series 1, 2008–09: Loukas Giorkas
• Series 2, 2009–10: Stavros Michalakakos
• Series 3, 2010–11: Haris Antoniou
• Series 4, 2016: Andreas Leontas
• Series 5, 2017: Panagiotis Koufogiannis
• Series 6, 2019: TBD

• Current
• Ramóna Kiss (7–)
• Zsófi Szabó (backstage, 8–)
• Former
• Nóra Ördög (1–3)
• Bence Istenes (4–6, 7 final)
• Balázs Sebestyén (1)
• Lilu (4)
• Dóra Kovács (backstage, 6)
• Alexandra Koholák (backstage, 7)

• Current
• ByeAlex (6–)
• Laci Gáspár (6–)
• Peti Puskás (6–)
• Gigi Radics (7–)
• Former
• Péter Geszti (1–4)
• Ildikó Keresztes (1–3)
• Miklós Malek (1–3)
• Feró Nagy (1–3)
• Róbert Alföldi (4–5)
• Róbert Szikora (4–5)
• Gabi Tóth (4–6)
• Little G Weevil (5)

• Series 1, 2010: Csaba Vastag
• Series 2, 2011: Tibor Kocsis
• Series 3, 2012: Gergő Oláh
• Series 4, 2013: Dóra Danics
• Series 5, 2014: Andi Tóth
• Series 6, 2016: Barbara Opitz
• Series 7, 2017: Ricco & Claudia
• Series 8, 2018: USNK
• Series 9, 2019: TBD

• Halla Vilhjálmsdóttir (1)

• Einar Bárðarson (1)
• Elínborg Halldórsdóttir (1)
• Páll Óskar Hjálmtýsson (1)

• Series 1, 2006–07: Jógvan Hansen

• Aditya Narayan

• Sonu Nigam
• Shreya Ghoshal
• Sanjay Leela Bhansali

• Season 1, 2011: Geet Sagar

• Robby Purba (1–2)

• Anggun (1)
• Ahmad Dhani (1–2)
• Bebi Romeo (1–2)
• Rossa (1–2)
• Afgan (2)

• Season 1, 2012–13: Fatin Shidqia
• Season 2, 2015: Jebe & Petty

• Bar Refaeli

• Subliminal (3–)
• Moshe Peretz (1–)
• Ivri Lider (1–)
• Shiri Maimon (1–)

Former

• Rami Fortis (1–2)

• Season 1, 2013–14: Rose Fostanes
• Season 2, 2015: Daniel Yafe
• Season 3, 2017–18: Eden Alene
• Season 4, 2019: TBD

• Alessandro Cattelan (5–12)
• Daniela Collu (Xtra Factor, 9–12)

Former

• Aurora Ramazzotti (X Factor daily, 9–11)
• Former
• Francesco Facchinetti (1–4; Xtra Factor, 4)
• Alessandra Barzaghi (Xtra Factor, 4)
• Max Novaresi (Xtra Factor, 5–6)
• Brenda Lodigiani (Xtra Factor, 5–6)
• Matteo Bordone (Xtra Factor, 7–8)
• Mara Maionchi (Xtra Factor, 8–11)

• Mara Maionchi (1–4, 11–)
• Lodo Guenzi (12–) (Live Shows)

Former

• Morgan (1–3, 5–8)
• Simona Ventura (1–2, 5–7)
• Claudia Mori (3)
• Anna Tatangelo (4)
• Enrico Ruggeri (4)
• Elio (4–7, 9)
• Arisa (5–6, 10)
• // Mika (7–9)
• Fedez (8–12)
• Victoria Cabello (8)
• Skin (9)
• Álvaro Soler (10)
• Manuel Agnelli (10–12)
• Levante (11)
• Asia Argento (12) (Auditions-judge's houses)

• Series 1, 2008: Aram Quartet
• Series 2, 2008–09: Matteo Becucci
• Series 3, 2009: Marco Mengoni
• Series 4, 2010: Nathalie
• Series 5, 2011: Francesca Michielin
• Series 6, 2012: Chiara Galiazzo
• Series 7, 2013: Michele Bravi
• Series 8, 2014: Lorenzo Fragola
• Series 9, 2015: Giosada
• Series 10, 2016: Soul System
• Series 11, 2017: Lorenzo Licitra
• Series 12, 2018: Anastasio
• Series 13, 2019: Upcoming season

• Jon Kabira
• Naomi Watanabe

• Kaz Utsunomiya
• Rino Nakasone
• Kiyoshi Matsuo

• Season 1, 2013–14: Sky's the Limit

• Current
• Daniyar Dzumadilov
• Former
• Adil Liyan (1)
• Arnur Istybaev (2–6)

• Current
• Nagima Eskalieva
• Nurbergen Makhambetov (5 from live–)
• Dilnaz Akhmadieva (4–5, until live, 7)
• Former
• Alexander Shevchenko (1–5)
• Sultana Karazhigitova (1–2, until live)
• Ismail Igіlmanov (2, from live)
• Erlan Kokeev (3)
• Eva Becher (6)

• Season 1, 2011: Dariya Gabdull
• Season 2, 2012: Andrey Tikhonov
• Season 3, 2013: Evgeniya Barysheva
• Season 4, 2013: Kairat Kapanov
• Season 5, 2014: Evgeny Vyblov
• Season 6, 2015: Astana Kargabay
• Season 7, 2018: Dilnura Birzhanova

• Markus Riva

• Reinis Sējāns
• Aija Auškāpa
• Intars Busulis

• Season 1, 2017: Artūrs Gruzdiņš
• Season 2, 2018: Kattie

• Current
• Martynas Starkus (2–)
• Former
• Marijonas Mikutavičius (1)

• Current
• Saulius Prūsaitis
• Saulius Urbonavičius
• Marijonas Mikutavičius (2–)
• Justina Arlauskaitė-Jazzu (3–)
• Former
• Vytautas Šapranauskas (1)
• Rūta Ščiogolevaitė (1–2)
• Andrius Mamontovas (5)

• Season 1, 2012–13: Giedrė Vokietytė
• Season 2, 2013–14: Žygimantas Gečas
• Season 3, 2015–16: Monika Pundziūtė
• Season 4, 2016–17: Iglė Bernotaitytė
• Season 5, 2017–18: 120
• Season 6, 2018–19: Good Time Boys

• Ben Camille

• Howard Keith Debono
• Ray Mercieca
• Alexandra Alden
• Ira Losco

• Season 1, 2018–2019: Michela Pace

• Zaw Htet (1)
• Hmu Thiha Thu (2)

• Si Thu Lwin (1–2)
• Nge Nge (1–2)
• Eaint Chit (1)
• Za War (1–2)
• Zam Nuu (2)

• Season 1, 2016: Htun Naung Sint
• Season 2, 2017: David Derrick
• Season 3, 2018: TBD

• Wendy van Dijk (1–4)
• Martijn Krabbe (2–5)
• Nathalie Bulters (Backstage, 3)
• Eva Treurniet (Backstage, 3)
• Lieke van Lexmond (Backstage, 4)
• Ferry Doedens (Backstage, 5)

• Former
• Henkjan Smits (1)
• Marianne van Wijnkoop (1)
• Henk Temming (1)
• Eric van Tijn (2–4)
• Stacey Rookhuizen (2–4)
• Angela Groothuizen (2–5)
• Gordon Heuckeroth (2–5)
• Ali Bouali (5)
• Candy Dulfer (5)

• Season 1, 2007: Sharon Kips
• Season 2, 2009: Lisa Hordijk
• Season 3, 2010: Jaap Reesema
• Season 4, 2011: Rochelle Perts
• Season 5, 2013: Haris Alagic

• Former
• Dominic Bowden
• Guy Williams (The Xtra Factor, 2)
• Sharyn Casey (The Xtra Factor, 2)
• Clint Roberts (The Xtra Factor, 2)
• Caito Potatoe aka Caitlin Davidson (The X Factor RAW, 2)

• Former
• Daniel Bedingfield (1)
• Ruby Frost (1)
• Stan Walker (1–2)
• Melanie Blatt (1–2)
• / Willy Moon (2, live show 1)
• / Natalia Kills (2, live show 1)
• Shelton Woolright (2, live show 2–end)
• Natalie Bassingthwaighte (2, live show 2–end)

• Series 1, 2013: Jackie Thomas
• Series 2, 2015: Beau Monga

• Ravi (2)
• Guri Solberg (2)
• Peter Moi Brubresko (Xtra Factor)
• Katarina Flatland (Xtra Factor)
• Charlotte Thorstvedt (1)

• Jan Fredrik Karlsen
• Elisabeth Andreassen (2)
• Marion Ravn (2)
• Klaus Sonstad (2)
• Mira Craig (1)
• Peter Peters (1)

• Season 1, 2009: Chand Torsvik
• Season 2, 2010: Hans Bollandsås

• KC Concepcion

• Martin Nievera
• Gary Valenciano
• Pilita Corrales
• Jake Zyrus

• Season 1, 2012: KZ Tandingan

• Patricia Kazadi (3–4)
• Jarosław Kuźniar (1–2)

• Czesław Mozil (1–4)
• Kuba Wojewódzki (1–4)
• Tatiana Okupnik (2–4)
• Ewa Farna (4)
• Maja Sablewska (1)

• Season 1, 2011: Gienek Loska
• Season 2, 2012: Dawid Podsiadło
• Season 3, 2013: Klaudia Gawor
• Season 4, 2014: Artem Furman

• João Manzarra
• Cláudia Vieira (2)
• Bárbara Guimarães (1)
• Carolina Torres (Factor Extra)
• Tiago Silva (Factor F)

• Sónia Tavares
• Paulo Junqueiro
• Paulo Ventura
• Miguel Guedes (2)

• Season 1, 2013–14: Berg
• Season 2, 2014: Kika Kardoso

• Răzvan Simion
• Dani Oțil

• Current
• Delia Matache (2–)
• Horia Brenciu (4–)
• Ștefan Bănică, Jr. (4–)
• Carla's Dreams (6–)
• Former
• Paula Seling (1)
• Mihai Morar (1)
• Adrian Sînă (1)
• Dan Bittman (2–3)
• Cheloo (2–3)

• Season 1, 2011–12: Andrei Leonte
• Season 2, 2012: Tudor Turcu
• Season 3, 2013: Florin Ristei
• Season 4, 2014: Adina Răducan
• Season 5, 2015: Florin Răduţă
• Season 6, 2016: Olga Verbiţchi
• Season 7, 2017: Jeremy Ragsdale
• Season 8, 2018: Bella Santiago

• Aleksey Chumakov (1–2, 4)
• Yelena Vorobey (1–2)
• Philipp Kirkorov (3–5)
• Vladimir Zelenski (3)
• Grigory Leps (6)
• Garik Martirosyan (6)
• Nargiz Zakirova (7)
• Ernest Matskyavichus (7)

• Valeriy Meladze (1–2)
• Valery Garkalin (2)
• Tigran Keosayan (2)
• Katerina Von Gechmen–Valdek (1)
• Aleksandr Revzin (1)
• Lolita Milyavskaya (3–5)
• Roman Emelyanov (3–5)
• Igor Nikolayev (4–5)
• Alla Pugacheva (chairperson, 3–5)
• Boris Krasnov (3)
• Walter Afanasieff (6)
• Zhanna Rozhdestvenskaya (6)
• Yuri Antonov (6)
• Sergey Chigrakov (6)
• Valery Leontiev (7)
• Diana Arbenina (7)
• Elena Vaenga (7)
• Vladimir Presnyakov (7)
• Nikolai Noskov (7, only auditions)
• Judges-producer
• Walter Afanasieff (6)
• Konstantin Meladze (6)
• Maxim Fadeev (6)
• Igor Matvienko (6)
• Viktor Drobysh (6)

• Season 1, 2005: Vladimir Sapovsky
• Season 2, 2007: Nikolay Timokhin
• Season 3, 2011: Sergei Savin
• Season 4, 2012: Alexey Sulima
• Season 5, 2013: Mali
• Season 6, 2015: Sardor Milano
• Season 7, 2015–16: Arseny Borodin

• Peter Poles
• Vid Valič

• Damjan Damjanovič
• Jadranka Juras
• Aleš Uranjek

• Season 1, 2012: Demetra Malalan

• Andile Ncube

• Arno Carstens
• Oskido
• Zonke

• Season 1, 2015: FOUR

• Nuria Roca (1–2)
• Jesús Vázquez (3)
• Xtra Factor
• Nando Escribano (3)

• Miqui Puig (1–2)
• Jorge Flo (1–2)
• Eva Perales (1–2)
• Laura Pausini (3)
• Risto Mejide (3)
• Xavi Martínez (3)
• Fernando Montesinos (3)

• Season 1, 2007: María Villalón
• Season 2, 2008: Vocal Tempo
• Season 3, 2018: Pol Granch
• Season 4, 2019: TBD

• David Hellenius

• Andreas Carlsson
• Marie Serneholt
• Orup
• Ison Glasgow

• Season 1, 2012: Awa Santesson-Sey

• Krit Sripoomseth

• Nitipong Honark [th]
• Jennifer Kim [th]
• Saksit Vejsupaporn
• Chalatit Tantiwut [th]

• Season 1, 2017: Slow
• Season 2, 2019: TBD

• Current
• Bülent Şakrak (1–)
• Former
• Kadir Doğulu (1)

• Ziynet Sali (1a)
• Emre Aydın (1a)
• Ömer Karacan (1a)
• Armağan Çağlayan (1a)
• Nigar Jamal (1b)
• Sinan Akçıl (1b)
• Atiye (1b)
• Nihat Odabaşı (1b)

• Season 1, 2014: Halil Polat

• Andrey Bednyakov (7–)

Former

• Oksana Marchenko (1–7)

• Current
• Andriy Danylko (7–)
• Anastasiya Kamenskykh (8–)
• Oleg Vinnik (8–)
• Dmytro Shurov (8–)

• Former
• Ihor Kondratiuk (1–6)
• Sergey Sosedov (1–6)
• Yolka (1–2)
• Seryoga (1–4)
• Irina Dubtsova (3–4)
• Nino Katamadze (5–6)
• Ivan Dorn (5)
• Andriy Khlyvniuk (6)
• Kostiantyn Meladze (7)
• Julia Sanina (7)
• Anton Savlepov (7)

• Season 1, 2010–11: Olexiy Kuznetsov
• Season 2, 2011–12: Viktor Romanchenko
• Season 3, 2012–13: Aida Nikolaychuk
• Season 4, 2013–14: Oleksandr Poriadynsky
• Season 5, 2014: Dmytro Babak
• Season 6, 2015: Kostyantyn Bocharov
• Season 7, 2016: Sevak Khanagyan
• Season 8, 2017: Misha Panchishyn
• Season 9, 2018: ZBSband
• Season 10, 2019: TBD

• Current
• / Dermot O'Leary (4–11, 13–)
• Becca Dudley (digital 14–)
• Former
• Kate Thornton (1–3)
• Caroline Flack (12)
• Olly Murs (12)
• Roman Kemp (digital, 13)
• The Xtra Factor
• Ben Shephard (1–3)
• Fearne Cotton (4)
• Holly Willoughby (5–6)
• / Konnie Huq (7)
• Caroline Flack (8–10)
• Olly Murs (8–9)
• Matt Richardson (10)
• Sarah-Jane Crawford (11)
• Rochelle Humes (12)
• Melvin Odoom (12)
• Rylan Clark-Neal (13)
• Matt Edmondson (13)

• Current
• Simon Cowell (1–7, 11–)
• / Ayda Field (15–)
• Robbie Williams (15–)
• Former
• Louis Walsh (1–11, 13–14)
• Sharon Osbourne (1–4, 10, 13–14)
• Dannii Minogue (4–7)
• Cheryl (5–7, 11–12)
• Kelly Rowland (8)
• Gary Barlow (8–10)
• Tulisa (8–9)
• Nicole Scherzinger (9–10, 13–14)
• Mel B (11)
• Nick Grimshaw (12)
• / Rita Ora (12)
• Louis Tomlinson (15)

• Series 1, 2004: Steve Brookstein
• Series 2, 2005: Shayne Ward
• Series 3, 2006: Leona Lewis
• Series 4, 2007: Leon Jackson
• Series 5, 2008: Alexandra Burke
• Series 6, 2009: Joe McElderry
• Series 7, 2010: Matt Cardle
• Series 8, 2011: Little Mix
• Series 9, 2012: James Arthur
• Series 10, 2013: Sam Bailey
• Series 11, 2014: Ben Haenow
• Series 12, 2015: Louisa Johnson
• Series 13, 2016: Matt Terry
• Series 14, 2017: Rak-Su
• Series 15, 2018: Dalton Harris

• Kate Thornton

• Simon Cowell
• Sharon Osbourne
• Louis Walsh

• Series 1, 2006: Lucy Benjamin

• Steve Jones (1)
• Khloé Kardashian (2)
• Mario Lopez (2–3)

• Simon Cowell
• L.A. Reid (1–2)
• Nicole Scherzinger (1)
• Paula Abdul (1)
• Cheryl (auditions, 1)
• Demi Lovato (2–3)
• Britney Spears (2)
• Kelly Rowland (3)
• Paulina Rubio (3)

• Season 1, 2011: / Melanie Amaro
• Season 2, 2012: Tate Stevens
• Season 3, 2013: Alex & Sierra

• Poncho de Anda (1)

• Belinda (1)
• Angélica María (1)
• Chyno Miranda (1)
• Nacho (1)

• Season 1, 2013: Los Tres Charritos

• Current
• Thành Trung (2–)
• Gil Lê (2–)
• Former
• Nguyên Khang
• Thu Thủy

• Current
• Hồ Quỳnh Hương
• Dương Khắc Linh
• Former
• Hồ Ngọc Hà (1)
• Đàm Vĩnh Hưng (1)
• Thanh Lam (2)
• Tùng Dương (2)

• Season 1, 2014: Giang Hồng Ngọc
• Season 2, 2016: Trần Minh Như
• Season 3, 2018: TBD

• Toolz

• M.I
• Reggie Rockstone
• Onyeka Onwenu

• Season 1, 2013: DJ Switch