Trailer
 | James McAvoy as Dennis / Patricia / Hedwig / The Beast / Kevin Wendell Crumb / Barry / Orwell / Jade |
 | Anya Taylor-Joy as Casey Cooke |
 | Haley Lu Richardson as Claire Benoit |
 | Jessica Sula as Marcia |
 | Betty Buckley as Dr. Karen Fletcher |
 | Izzie Coffey as Five-Year-Old Casey |
 | Brad William Henke as Uncle John |
 | Sebastian Arcelus as Casey's Father |
 | Neal Huff as Mr. Benoit |
 | Ukee Washington as News Anchor |
 | Ann Wood as Game Show Enthusiast |
| Robert Michael Kelly as Joe |
 | M. Night Shyamalan as Jai, Hooters Lover |
 | Rosemary Howard as Kevin's Mother |
| Jerome Gallman as Vince, Security Guard |
 | Lyne Renee as Academic Moderator |
| Kate Jacoby as Dr. Fletcher's Patient |
 | Peter Patrikios as Taxi Driver |
 | Kash Goins as Flower Kiosk Worker |
 | Roy James Wilson as Security Guy with Dog |
 | Christopher Lee Philips as Older Worker |
| Julie Potter as Paramedic |
 | Ameerah Briggs as Police Officer #1 |
 | Nakia Dillard as Police Officer #2 |
 | Robin Rieger as Television Reporter |
 | Emlyn McFarland as Diner Waitress |
 | Dann Fink as Game Show Contestant (voice) |
 | Bruce Winant as Game Show Host (voice) |
 | Bruce Willis as David Dunn (uncredited) |
 | Kim Director as Hannah (uncredited) |
 | Robert Bizik as Bar Patron (uncredited) |
| Junnie Lopez as Geraldo (uncredited) |
| Steven Dennis as Dan at Next Table (uncredited) |
| Matthew Nadu as Waiter (uncredited) |
| James Robinson Jr. as Claire's Party Guest (uncredited) |
| John Mitchell as EMT (uncredited) |
| Aleksandra Svetlichnaya as Pedestrian (uncredited) |
| Colin Campbell as Boy in Park (uncredited) |
| John Jillard Sr. as Homeland Security (uncredited) |
 | Vincent Riviezzo as Detective (uncredited) |
 | Gary Ayash as Restaurant Patron (uncredited) |
| Directing | |
| M. Night Shyamalan | Director |
Writing | |
| M. Night Shyamalan | Writer |
Sound | |
| Alex Alcántara | ADR & Dubbing |
| Toño Cubillo | ADR & Dubbing |
Art | |
| Mara LePere-Schloop | Production Design |
Production | |
| Phillip Dawe | Executive In Charge Of Post Production |
| John Burton West | Unit Production Manager |
Art | |
| Dennis Madigan | Set Decoration |
Camera | |
| Linda Källérus | Still Photographer |
Production | |
| Colleen Kay | Casting Associate |
| Jason Blum | Producer |
Art | |
| Jesse Rosenthal | Art Direction |
Crew | |
| Matthew Shapiro | Post Production Supervisor |
Directing | |
| Nicole Agostino | Assistant Director |
Crew | |
| Tyler Lockard | Compositors |
Production | |
| Ashwin Rajan | Executive Producer |
Art | |
| Dave Kellom | Art Department Coordinator |
| Paul Maiello | Construction Coordinator |
| Nicole Reed LeFevre | Set Designer |
Sound | |
| Jerry Yuen | Boom Operator |
Production | |
| M. Night Shyamalan | Producer |
Editing | |
| Luke Ciarrocchi | Editor |
Art | |
| Jennifer Engel | Set Decoration |
Lighting | |
| Thomas Devine | Electrician |
Camera | |
| Andy Hensler | Additional Camera |
Crew | |
| Kurt Wunder | Special Effects Coordinator |
Production | |
| Steven Schneider | Executive Producer |
| Douglas Aibel | Casting |
Costume & Make-Up | |
| Paco Delgado | Costume Design |
Sound | |
| Rodrigo Díaz | ADR & Dubbing |
Camera | |
| Kyle Rudolph | Camera Operator |
Crew | |
| Wyatt Sprague | Sound Recordist |
Camera | |
| Michael Leonard | First Assistant Camera |
Sound | |
| Tod A. Maitland | Sound Mixer |
Crew | |
| Stephen Izzi | Stunts |
| Manny Siverio | Stunt Coordinator |
| Anteneh Adamu | Compositors |
Camera | |
| Daniel Rieser | Grip |
Visual Effects | |
| Colton Miller | VFX Supervisor |
| Jennifer Wessner | Visual Effects Producer |
Lighting | |
| Ryan 'Sparks' Lynch | Lighting Technician |
Visual Effects | |
| Ed Mendez | Visual Effects Supervisor |
| Richard Aponte | VFX Artist |
Camera | |
| Jon Sibert | Key Grip |
Art | |
| Susannah McCarthy | Property Master |
Directing | |
| Charles S. Rowe | Script Supervisor |
Costume & Make-Up | |
| Angeline Zeigler | Set Costumer |
Sound | |
| Pepe Pleguezuelos | Supervising Dialogue Editor |
Art | |
| Sharon Potts | Assistant Property Master |
Camera | |
| Ken McCallum | Dolly Grip |
Costume & Make-Up | |
| Teresa Binder Westby | Assistant Costume Designer |
Visual Effects | |
| Rachel Ambelang | VFX Editor |
Art | |
| Aaron Becker | Title Designer |
Camera | |
| Mike Gioulakis | Director of Photography |
Costume & Make-Up | |
| Kara Morasco | Tailor |
| Rita Squitiere | Costume Supervisor |
| Diane Dixon | Hair Department Head |
| Pamela Peitzman | Makeup Department Head |
Sound | |
| Lawrence Zipf | Sound Effects Editor |
| Steve F.B. Smith | Sound Designer |
| Susan Jacobs | Music Supervisor |
Editing | |
| Kathryn Cates | Assistant Editor |
Production | |
| Jason Loftus | Local Casting |
Costume & Make-Up | |
| Janice Innella | Key Hair Stylist |
Sound | |
| West Dylan Thordson | Original Music Composer |
Art | |
| Joshua Clarke | Location Scout |
Production | |
| Henry Russell Bergstein | Casting Associate |
Crew | |
| Alejandro Monzon | Compositors |
Production | |
| Diane Heery | Local Casting |
Costume & Make-Up | |
| Ray Santoleri | Makeup Artist |
Production | |
| Dom Catanzarite | Associate Producer |
Editing | |
| Bryan Baker | Assistant Editor |
Production | |
| Kevin Scott Frakes | Executive Producer |
| Buddy Patrick | Executive Producer |
Crew | |
| Mark Lieberman | Compositors |
Production | |
| Staci Hagenbaugh | Location Manager |
Camera | |
| John Baer | Still Photographer |
Production | |
| Marc Bienstock | Producer |
Sound | |
| Skip Lievsay | Supervising Sound Editor |
Art | |
| Brick Mason | Storyboard Artist |
Sound | |
| Michael Feuser | Dialogue Editor |
Production | |
| Marc Bienstock | Unit Production Manager |
Directing | |
| John Rusk | First Assistant Director |
| Amy Lauritsen | Second Assistant Director |
Crew | |
| Zack Roberts | Stunts |
| Chris Colombo | Stunts |
| Roberto Lopez | Stunts |
| Stephen Mann | Stunts |
| John McEnerney | Stunts |
Editing | |
| Michael Hatzer | Digital Colorist |
