| •Ryan Seacrest | played | Himself (Host) |
| •Simon Cowell | played | Himself (Judge) |
| •Paula Abdul | played | Herself (Judge) |
| •Randy Jackson | played | Himself (Judge) |
| •Brian Dunkleman | played | Himself (Host (S01)) |
| •Kristin Holt | played | Herself (Special Correspondent (S02)) |
| •Alaina Whitaker | played | Herself (S07, 18th Place) |
| •Alexandréa Lushington | played | Herself (S07, 19th Place) |
| •Amanda Overmyer | played | Herself (S07, 11th Place) |
| •Amy Davis | played | Herself (S07, 23rd Place) |
| •Asia'h Epperson | played | Herself (S07, 14th Place) |
| •Brooke White | played | Herself (S07, Top 6) |
| •Carly Smithson | played | Herself (S07, Top 6) |
| •Chikezie Eze | played | Himself (S07, 10th Place) |
| •Colton Berry | played | Himself (S07, 21st Place) |
| •Danny Noriega | played | Himself (S07, 13th Place) |
| •David Archuleta | played | Himself (S07, Top 6) |
| •David Cook (4) | played | Himself (S07, Top 6) |
| •David Hernandez (2) | played | Himself (S07, 12th Place) |
| •Garrett Haley | played | Himself (S07, 24th Place) |
| •Jason Castro | played | Himself (S07, Top 6) |
| •Jason Yeager | played | Himself (S07, 20th Place) |
| •Joanne Borgella | played | Herself (S07, 22nd Place) |
| •Kady Malloy | played | Herself (S07, 16th Place) |
| •Kristy Lee Cook | played | Herself (S07, 7th Place) |
| •Luke Menard | played | Himself (S07, 15th Place) |
| •Michael Johns | played | Himself (S07, 8th Place) |
| •Ramiele Malubay | played | Herself (S07, 9th Place) |
| •Robbie Carrico | played | Himself (S07, 17th Place) |
| •Syesha Mercado | played | Herself (S07, Top 6) |
| •A. J. Tabaldo | played | Himself (S06, 17th Place) |
| •Alaina Alexander | played | Herself (S06, 18th Place) |
| •Amy Krebs | played | Herself (S06, 23rd Place) |
| •Antonella Barba | played | Herself (S06, 15th Place) |
| •Blake Lewis | played | Himself (S06, Runner-up) |
| •Brandon Rogers | played | Himself (S06, 12th Place) |
| •Chris Richardson | played | Himself (S06, 6th Place) |
| •Chris Sligh | played | Himself (S06, 10th place) |
| •Gina Glocksen | played | Herself (S06, 9th Place) |
| •Haley Scarnato | played | Herself (S06, 8th Place) |
| •Jared Cotter | played | Himself (S06, 16th Place) |
| •Jordin Sparks | played | Herself (S06, Winner) |
| •Lakisha Jones | played | Herself (S06, 4th Place) |
| •Leslie Hunt | played | Herself (S06, 19th Place) |
| •Melinda Doolittle | played | Herself (S06, 3rd Place) |
| •Nicholas Pedro | played | Himself (S06, 20th Place (Dropped out in Season 5)) |
| •Nicole Tranquillo | played | Herself (S06, 22nd Place) |
| •Paul Kim | played | Himself (S06, 24th Place) |
| •Phil Stacey | played | Himself (S06, 5th Place) |
| •Rudy Cardenas | played | Himself (S06, 21st Place) |
| •Sabrina Sloan | played | Herself (S06, 14th Place) |
| •Sanjaya Malakar | played | Himself (S06, 7th Place) |
| •Stephanie Edwards | played | Herself (S06, 11th Place) |
| •Sundance Head | played | Himself (S06, 13th Place) |
| •Ace Young | played | Himself (S05, 7th Place) |
| •Ayla Brown | played | Herself (S05, 14th Place) |
| •Becky O'Donohue | played | Herself (S05, 24th Place) |
| •Bobby Bennett (6) | played | Himself (S05, 22nd Place) |
| •Brenna Gethers | played | Herself (S05, 20th Place) |
| •Bucky Covington | played | Himself (S05, 8th Place) |
| •Chris Daughtry (2) | played | Himself (S05, 4th Place) |
| •David Radford | played | Himself (S05, 18th Place) |
| •Elliott Yamin | played | Himself (S05, 3rd Place) |
| •Gedeon McKinney | played | Himself (S05, 13th Place) |
| •Heather Cox | played | Herself (S05, 19th Place) |
| •Jose 'Sway' Penala | played | Himself (S05, 17th Place) |
| •Katharine McPhee | played | Herself (S05, Runner-up) |
| •Kellie Pickler | played | Herself (S05, 6th Place) |
| •Kendall Phillips | played | Herself (S05, Top 24) |
| •Kevin Covais | played | Himself (S05, 11th Place) |
| •Kinnik Sky | played | Herself (S05, 16th Place) |
| •Lisa Tucker | played | Herself (S05, 10th Place) |
| •Mandisa | played | Herself (S05, 9th Place) |
| •Melissa McGhee | played | Herself (S05, 12th Place) |
| •Paris Bennett | played | Herself (S05, 5th Place) |
| •Patrick Hall | played | Himself (S05, 21st Place) |
| •Stevie Scott | played | Herself (S05, 23rd Place) |
| •Taylor Hicks | played | Himself (S05, Winner) |
| •Will Makar | played | Himself (S05, 15th Place) |
| •Aloha Mischeaux | played | Herself (S04, 19th Place) |
| •Amanda Avila | played | Herself (S04, 14th Place) |
| •Anthony Fedorov | played | Himself (S04, 4th Place) |
| •Anwar Robinson | played | Himself (S04, 7th Place) |
| •Bo Bice | played | Himself (S04, Runner-up) |
| •Carrie Underwood | played | Herself (S04, Winner) |
| •Celena Rae Batchelor | played | Herself (S04, 20th Place) |
| •Constantine Maroulis | played | Himself (S04, 6th Place) |
| •David Brown (1) | played | Himself (S04, 17th Place) |
| •Janay Castine | played | Herself (S04, 13th Place) |
| •Jared Yates | played | Himself (S04, 23rd Place) |
| •Jessica Sierra | played | Herself (S04, 10th Place) |
| •Joseph Murena, Jr. | played | Himself (S04, 18th Place) |
| •Judd Harris | played | Himself (S04, 21st Place) |
| •Lindsey Cardinale | played | Herself (S04, 12th Place) |
| •Mario Vazquez | played | Himself (S04, Dropped out) |
| •Melinda Lira | played | Herself (S04, 24th Place) |
| •Mikalah Gordon | played | Herself (S04, 11th Place) |
| •Nadia Turner | played | Herself (S04, 8th Place) |
| •Nikko Smith | played | Himself (S04, 9th Place) |
| •Sarah Mather | played | Herself (S04, 22nd Place) |
| •Scott Savol | played | Himself (S04, 5th Place) |
| •Travis Tucker | played | Himself (S04, 16th Place) |
| •Vonzell Solomon | played | Herself (S04, 3rd Place) |
| •Amy Adams (2) | played | Herself (S03, 10th Place) |
| •Ashley Thomas | played | Herself (S03, Semifinalist) |
| •Briana Ramirez-Real | played | Herself (S03, Semifinalist) |
| •Camile Velasco | played | Herself (S03, 9th Place) |
| •Charly Lowry | played | Herself (S03, Semifinalist) |
| •Diana DeGarmo | played | Herself (S03, Runner-up) |
| •Donnie Williams (1) | played | Himself (S03, Disqualified) |
| •Elizabeth Letendre | played | Herself (S03, Semifinalist) |
| •Eric Yoder | played | Himself (S03, Semifinalist) |
| •Erskine Walcott | played | Himself (S03, Semifinalist) |
| •Fantasia Barrino | played | Herself (S03, Winner) |
| •George Huff | played | Himself (S03, 5th Place) |
| •Heather Piccinini | played | Herself (S03, Semifinalist) |
| •Jasmine Trias | played | Herself (S03, 3rd Place) |
| •Jennifer Hudson | played | Herself (S03, 7th Place) |
| •Jesus Roman | played | Himself (S03, Semifinalist) |
| •John Preator | played | Himself (S03, Semifinalist) |
| •John Stevens | played | Himself (S03, 6th Place) |
| •Jon Peter Lewis (1) | played | Himself (S03, 8th Place) |
| •Jonah Moananu | played | Himself (S03, Semifinalist) |
| •Kara Master | played | Herself (S03, Semifinalist) |
| •Katie Webber | played | Herself (S03, Semifinalist) |
| •LaToya London | played | Herself (S03, 4th Place) |
| •Leah LaBelle | played | Herself (S03, 12th Place) |
| •Lisa Leuschner | played | Herself (S03, Semifinalist) |
| •Lisa Marie Wilson | played | Herself (S03, Semifinalist) |
| •Marisa Joy | played | Herself (S03, Semifinalist) |
| •Marque Lynche (1) | played | Himself (S03, Semifinalist) |
| •Matthew Metzger | played | Himself (S03, Semifinalist) |
| •Matthew Rogers | played | Himself (S03, 11th Place) |
| •Noel Roman | played | Himself (S03, Semifinalist) |
| •Susan Vulaca | played | Herself (S03, Semifinalist) |
| •Tiara Purifoy | played | Herself (S03, Semifinalist) |
| •Aliceyn Cooney | played | Herself (S02, Semifinalist) |
| •Ashley Hartman | played | Herself (S02, Semifinalist) |
| •Bettis Richardson | played | Himself (S02, Semifinalist) |
| •Candice Coleman | played | Herself (S02, Semifinalist) |
| •Carmen Rasmusen | played | Herself (S02, 6th Place) |
| •Charles Grigsby | played | Himself (S02, 11th Place) |
| •Chip Days (1) | played | Himself (S02, Semifinalist) |
| •Clay Aiken | played | Himself (S02, Runner-up) |
| •Corey Clark (1) | played | Himself (S02, 9th Place (Disqualified)) |
| •Equoia Coleman | played | Herself (S02, Semifinalist) |
| •George Trice | played | Himself (S02, Semifinalist) |
| •Hadas Shalev | played | Herself (S02, Semifinalist) |
| •J. D. Adams | played | Himself (S02, Semifinalist) |
| •Jacob John Smalley | played | Himself (S02, Semifinalist) |
| •Janine Falsone | played | Herself (S02, Semifinalist) |
| •Jennifer Fuentes | played | Herself (S02, Semifinalist) |
| •Jordan Segundo | played | Himself (S02, Semifinalist) |
| •Joshua Gracin | played | Himself (S02, 4th Place) |
| •Juanita Barber | played | Herself (S02, Semifinalist) |
| •Julia DeMato | played | Herself (S02, 10th Place) |
| •Kimberley Locke | played | Herself (S02, 3rd Place) |
| •Kimberly Caldwell | played | Herself (S02, 7th Place) |
| •Kimberly Kelsey | played | Herself (S02, Semifinalist) |
| •Louis Gazzara | played | Himself (S02, Semifinalist) |
| •Meosha Denton | played | Herself (S02, Semifinalist) |
| •Nasheka Siddall | played | Herself (S02, Semifinalist) |
| •Olivia Mojica | played | Herself (S02, Semifinalist) |
| •Patrick Fortson | played | Himself (S02, Semifinalist) |
| •Patrick Lake | played | Himself (S02, Semifinalist) |
| •Rebecca Bond | played | Herself (S02, Semifinalist) |
| •Rickey Smith | played | Himself (S02, 8th Place) |
| •Ruben Studdard | played | Himself (S02, Winner) |
| •Samantha Cohen | played | Herself (S02, Semifinalist) |
| •Sylvia Chibiliti | played | Herself (S02, Semifinalist) |
| •Trenyce | played | Herself (S02, 5th Place) |
| •Vanessa Olivarez | played | Herself (S02, 12th Place) |
| •A. J. Gil (1) | played | Himself (S01, 8th Place) |
| •Adriel Herrera | played | Himself (S01, Semifinalist) |
| •Alexandra Bachelier | played | Herself (S01, Semifinalist) |
| •Alexis Lopez | played | Herself (S01, Semifinalist) |
| •Angela J. Peel | played | Herself (S01, Semifinalist) |
| •Brad Estrin | played | Himself (S01, Semifinalist) |
| •Christina Christian | played | Herself (S01, 6th Place) |
| •Christopher Aaron | played | Himself (S01, Semifinalist) |
| •Christopher Badano | played | Himself (S01, Semifinalist) |
| •EJay Day | played | Himself (S01, 10th Place) |
| •Gil Sinuet | played | Himself (S01, Semifinalist) |
| •Jamar | played | Himself (S01, Semifinalist) |
| •Jazmin Lowery | played | Herself (S01, Semifinalist) |
| •Jazmin Lowery | played | Herself (S01, Semifinalist) |
| •Jim Verraros | played | Himself (S01, 9th Place) |
| •Justin Guarini | played | Himself (S01, Runner-up) |
| •Justinn Waddell | played | Himself (S01, Semifinalist) |
| •Kelli Glover | played | Herself (S01, Semifinalist) |
| •Kelly Clarkson | played | Herself (S01, Winner) |
| •Khaleef Chiles | played | Himself (S01, Semifinalist) |
| •Mark Scott (4) | played | Himself (S01, Semifinalist) |
| •Melanie Sanders | played | Herself (S01, Semifinalist) |
| •Natalie Burge | played | Herself (S01, Semifinalist) |
| •Nikki McKibbin | played | Herself (S01, 3rd Place) |
| •R. J. Helton (1) | played | Himself (S01, 5th Place) |
| •Rodesia Eaves | played | Herself (S01, Semifinalist) |
| •Ryan Starr | played | Herself (S01, 7th Place) |
| •Tamyra Gray | played | Herself (S01, 4th Place) |
| •Tanesha Ross | played | Herself (S01, Semifinalist) |
| •Tenia Taylor | played | Herself (S01, Semifinalist) |
