The following are noteworthy figures within the global X Factor franchise, sorted by country of version.
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Australia
- Adam Lambert (Judge, 2016)
- Dami Im (Winner, 2013)
- Guy Sebastian (Judge, 2010 — 2012; 2015 — 2016)
- Iggy Azalea (Judge, 2016)
- James Blunt (Judge, 2015)
- Reece Mastin (Winner, 2011)
- Samantha Jade (Winner, 2012)
Bulgaria
- Poli Genova (Judge, 2013)
Finland
- Saara Aalto (Judge, 2018 —) note
Italy
- Asia Argento (Auditions judge, 2018 note )
- Francesca Michielin (Winner, 2014)
- Mahmood (Finalist, 2012)
- Måneskin (Runners-up, 2017)
- Marco Mengoni (Winner, 2009)
- Mika (Judge, 2013 — 2015, 2020)
- Skin (Judge, 2015)
Malta
- Destiny Chukunyere (Winner, 2019/2020)
New Zealand
- Natalia Kills (Judge, 2015)
United Kingdom
- Alexandra Burke (Winner, 2008; guest judge, 2011)
- Anastacia (Guest judge, 2012)
- Cher Lloyd (Finalist, 2010)
- Cheryl (Judge, 2008 — 2010, 2014 — 2015)
- Chris Moyles (Finalist, Battle of the Stars)
- Diana Vickers (Finalist, 2008)
- Gary Barlow (Judge, 2011 — 2013)
- Katy Perry (Guest judge, 2010)
- Kelly Rowland (Judge, 2011)
- Leona Lewis (Winner, 2006; guest judge, 2012; judge, The Band)
- Little Mix (Winners, 2011)
- Lucie Jones (Finalist, 2009)
- Kevin McHale (Finalist, Celebrity)
- Nicole Scherzinger (Guest judge, 2010; judge, 2012 — 2013, 2016 — 2017, Celebrity, The Band)
- Olly Murs (Runner-up, 2009; Xtra Factor co-host, 2011 — 2012; co-host, 2015)
- One Direction (Finalists, 2010)
- Pixie Lott (Guest judge, 2012)
- Rita Ora (Guest judge, 2012; judge, 2015)
- Robbie Williams (Judge, 2018)
- Saara Aalto (Runner-up, 2016) note
- Tulisa (Judge, 2011 — 2012; guest judge, 2014)
- Vinnie Jones (Finalist, Celebrity)
United States
- Britney Spears (Judge, 2012)
- Cheryl (Auditions judge, 2011 note )
- Demi Lovato (Judge, 2012 — 2013)
- Fifth Harmony (Finalists, 2012)
- Kelly Rowland (Judge, 2013)
- Nicole Scherzinger (Judge, 2011) note
- Paula Abdul (Judge, 2011)
Turkey (X Factor: Star Işığı)
- Nikki Jamal (Judge, 2014)
