 | Jack Black als Jonathan Barnavelt |
 | Cate Blanchett als Florence Zimmerman |
 | Owen Vaccaro als Lewis Barnavelt |
 | Kyle MacLachlan als Isaac Izard |
 | Renée Elise Goldsberry als Selena Izard |
 | Colleen Camp als Mrs. Hanchett |
 | Sunny Suljic als Tarby Corrigan |
 | Lorenza Izzo als Mrs. Barnavelt |
 | Braxton Bjerken als Woody Mingo |
 | Vanessa Anne Williams als Rose Rita Pottinger |
 | Ricky Muse als Bus Driver |
 | Charles Green als Soda Jerk |
 | De'Jon Watts als Clark |
 | Aaron Beelner als Clown Automaton #1 |
 | Joshua Phillips als Clown Automaton #2 |
 | Christian Calloway als Azazel |
 | Caleb Lawrence als Sweet Shop Employee |
 | Dylan Gage als Sweet Shop Boy |
 | Jalyn Hall als Devin |
 | Jackson T. Giles IV als Student |
 | Eli Roth als Comrade Ivan |
 | Alli Beckman als Magician's Assistant |
 | Emily Brobst als (uncredited) |
| Eric Kripke | Screenplay |
| John Bellairs | Novel |
| Eli Roth | Director |
| Brad Fischer | Producer |
| Laeta Kalogridis | Executive Producer |
| Eric Kripke | Producer |
| W. Mark McNair | Executive Producer |
| Tracey Nyberg | Executive Producer |
| William Sherak | Executive Producer |
| James Vanderbilt | Producer |
| Nicole Abellara Hallman | Casting |
| Jeanne McCarthy | Casting |
| Andres Cubillan | Art Direction |
| Walter P. Martishius | Art Direction |
| Ellen Brill | Set Decoration |
| Tommy Wilson | Set Decoration |
| Andrew S. Eisen | Editor |
| Fred Raskin | Editor |
| Rogier Stoffers | Director of Photography |
| Nathan Barr | Original Music Composer |
| Peter Staubli | Sound Designer |
| Jon Title | Sound Designer |
| Randy Torres | Sound Designer |
| Marlene Stewart | Costume Design |
| Holly Bario | Co-Producer |
| Jon Hutman | Production Design |
| Natalie Angel | Production Supervisor |
| Richard E. Chapla Jr. | Unit Production Manager |
| Mark Graziano | Executive In Charge Of Post Production |
| Chris Hadlock | Production Executive |
| W. Mark McNair | Unit Production Manager |
| Justin Ostensen | Post Production Assistant |
| Shelly Strong | Executive In Charge Of Production |
| Justin Wagman | Post Production Supervisor |
| Philip Banks | Additional Second Assistant Director |
| Tom Davies | First Assistant Director |
| Aaron C. Fitzgerald | Second Assistant Director |
| Aldric La'Auli Porter | First Assistant Director |
| Zack Smith | Second Second Assistant Director |
| Richard Oswald | Second Assistant Director |
| Dawn Swiderski | Supervising Art Director |
| Tristan Paris Bourne | Art Direction |
| Cassidy Shipley | Art Direction |
| Mathieu Baptista | Special Effects Makeup Artist |
| Martial Corneville | Hairstylist |
| Demetrice Dixon | Key Hair Stylist |
| LaToya Henderson | Makeup Artist |
| Jack Lazzaro | Key Makeup Artist |
| Fleur Morell | Makeup Department Head |
| Adrien Morot | Makeup Designer |
| Kathy Tse | Makeup Effects Designer |
| Vague Vartanian | Special Effects Makeup Artist |
| Melizah Anguiano Wheat | Hair Department Head |
| Richard Bennett | Storyboard Artist |
| Fritz Buckley | Assistant Property Master |
| Craig Dickerson | Greensman |
| Alícia Díaz | Scenic Artist |
| Brad Einhorn | Property Master |
| Jonathan Gesinski | Storyboard Artist |
| Craig Gilmore | Storyboard Artist |
| Derek J. Hawthorne | Scenic Artist |
| Scott Herbertson | Set Designer |
| Bria Kinter | Set Designer |
| Michael LaCorte | Art Department Coordinator |
| Rob Mallard | Leadman |
| Thomas Minton | Set Designer |
| Ruth Mitchell | Scenic Artist |
| Clint Schultz | Graphic Designer |
| Paul Sonski | Set Designer |
| Tommy Strickland | Greensman |
| Jason Sweers | Graphic Designer |
| Keith Thompson | Concept Artist |
| Scott Troha | Leadman |
| Douglas Womack | Construction Coordinator |
| James Ashwill | Foley Mixer |
| Karen Baker Landers | Supervising Sound Editor |
| Bob Beemer | Sound Re-Recording Mixer |
| C. Douglas Cameron | Boom Operator |
| Charlie Campagna | Sound Designer |
| John T. Cucci | Foley Artist |
| Richard Duarte | Foley Mixer |
| Paul Flinchbaugh | Assistant Sound Editor |
| Chris Jargo | Supervising ADR Editor |
| Bob Kellough | Sound Effects Editor |
| Evan Kishiyama | Sound Recordist |
| Dan O'Connell | Foley Artist |
| Jessie Pariseau | Foley Editor |
| Michelle Pazer | Dialogue Editor |
| Tobias Poppe | Sound Designer |
| Gary Rizzo | Sound Re-Recording Mixer |
| Ann Scibelli | Sound Designer |
| D. Chris Smith | Supervising Sound Editor |
| Yentle Ansay | Visual Effects Coordinator |
| Lance Gilbert | Stunt Coordinator |
| Nate Andrade | Stunts |
| Delmar Reyna | Stunt Double |
| Phedra Syndelle | Stunt Double |
| Amy Lynn Tuttle | Stunt Double |
| Todd Warren | Stunt Double |
| Jimmy Waitman | Stunt Double |
| Tony Vo | Stunts |
| Alli Beckman | Stunts |
| Emily Brobst | Stunt Double |
| Shawn Kautz | Stunts |
| Adam Lytle | Stunts |
| T. Ryan Mooney | Stunts |
| Josh Mueller | Stunts |
| Marque Ohmes | Stunts |
| Kyle Z. Anderson | Lighting Technician |
| Chris Birdsong | Key Grip |
| Chrys Blackstone | Electrician |
| Andre Booker | Rigging Grip |
| Carl Boyajian | Rigging Grip |
| Richard Cantu | Camera Operator |
| Kelly Clear | Gaffer |
| Quantrell D. Colbert | Still Photographer |
| Jamaal Crosby | Electrician |
| Greg Davis | Rigging Gaffer |
| Linton Flowers | Best Boy Grip |
| Scott Forte | Second Assistant "A" Camera |
| Wes Gilbert | Dolly Grip |
| Caleb Holland | Epk Camera Operator |
| Gregory Irwin | First Assistant "A" Camera |
| Justin Yardley Jones | Rigging Grip |
| Tom Jordan | First Assistant "B" Camera |
| Thomas Lappin | Camera Operator |
| Bruce Leefook | Electrician |
| Colin Lutke | Electrician |
| Reynaldo Ali Sable | Electrician |
| Scott Sealock | Rigging Grip |
| Paul Sgroi | Rigging Grip |
| Chris Shrider | Electrician |
| Randy Tharpe | Rigging Grip |
| Aidyn Timothy | Rigging Grip |
| Rebecca Ulmo | Second Assistant "B" Camera |
| Samuel A. Vura | Electrician |
| Jennifer Cram | Casting Associate |
| Tammy L. Smith | Extras Casting |
| Ashlyn Angel | Costume Supervisor |
| Mila Hermanovski | Assistant Costume Designer |
| Dinah Lightsey | Seamstress |
| Hope Slepak | Costume Supervisor |
| Hayley Stuppel | Key Costumer |
| Lindsay Armstrong | Assistant Editor |
| Elizabeth Cirillo | Assistant Editor |
| Ron Stanik | Assistant Editor |
| Chris Tonick | Assistant Editor |
| Josh Woolf | Post Production Coordinator |
| Jeremy Borum | Orchestrator |
| Robin Whittaker | Music Editor |
| Martin Kitrosser | Script Supervisor |
| Melba Jane Armistead | Set Medic |
| Lucia Maria Cesari | Studio Teacher |
| Kat Delay | Production Secretary |
| Maria DeVane | Production Controller |
| Denise Godoy | Unit Publicist |
| Frances Heeber | Studio Teacher |
| Kathy Chambless Oliver | Production Coordinator |
| Tim Monich | Dialect Coach |
| Nadine F. Wilson | Production Accountant |
| Troy Gilbert | Stunts |
