 | Taissa Farmiga als Sister Irene |
 | Demián Bichir als Father Burke |
 | Bonnie Aarons als The Nun / Valak |
 | Jonas Bloquet als Maurice Theriault |
 | Ingrid Bisu als Sister Oana |
 | Patrick Wilson als Ed Warren |
 | Vera Farmiga als Lorraine Warren |
 | Lili Taylor als Carolyn Perron |
 | Charlotte Hope als Sister Victoria |
 | Sandra Teles als Sister Ruth |
 | Maria Obretin als Sister Abigail |
 | August Maturo als Daniel |
 | Jack Falk als Daniel |
 | Lynnette Gaza als Mother Superior |
 | Ani Sava als Sister Jessica |
 | Michael Smiley als Father Pasquale |
 | Gabrielle Downey als The Abbess |
 | David Horovitch als Cardinal Conroy |
 | Tudor Munteanu als Grigore |
 | Lili Bordán als Waitress Marta |
 | Scarlett Hicks als Scarlett |
| Izzie Coffey als Student |
 | Jared Morgan als Marquis |
 | Laur Dragan als Villager |
 | Eugeniu Cozma als Villager |
 | Manuela Ciucur als Sister Christine |
 | Beatrice Péter als Praying Nun |
 | Ana Udroiu als Praying Nun |
 | Andreea Sovan als Praying Nun |
 | Dana Voicu als Praying Nun |
 | Andreea Moldovianu als Praying Nun |
 | Beatrice Rubica als Praying Nun |
 | Claudia Susanu als Praying Nun |
 | Boiangiu Alma als Demon Nun |
| Gabriela Irina Dinca als Demonic Nun |
 | Dee Bradley Baker als Demonic Voice |
 | Debra Wilson als Demonic Voice |
 | Mark Steger als Duke |
 | Lidiya Korotko als Barmaid |
 | Emma Appleton als Elena (uncredited) |
 | Jonny Coyne als Gregoro |
| Natalie Creek als 1950's Catholic School Girl (uncredited) |
 | Flynn Hayward als Sister Samantha (uncredited) |
 | Daniel Mandehr als Farmer Jozef |
 | Samson Marraccino als Timothy (uncredited) |
 | Jamie Muscato als Father Patino (uncredited) |
 | Lourdes Nadres als Nun (uncredited) |
 | Simon Rhee als Holy Man 1 (uncredited) |
 | Sandra Rosko als Captured Nun (uncredited) |
| HayRae Rummel als Catholic School Girl (uncredited) |
| Claudio Lee Smith als Demon (uncredited) |
| James Wan | Producer |
| James Wan | Story |
| Maxime Alexandre | Director of Photography |
| Walter Hamada | Executive Producer |
| Peter Safran | Producer |
| Richard Brener | Executive Producer |
| Adrian Curelea | Art Direction |
| Gina Calin | Set Decoration |
| Susan L. Bertram | Costume Supervisor |
| Eduard Daniel Vraciu | Art Direction |
| Andy Hay | Sound Re-Recording Mixer |
| Jennifer Spence | Production Design |
| Kurt Bryant | Stunt Coordinator |
| Abel Korzeniowski | Music |
| Rich Delia | Casting |
| Ken Blackwell | Editor |
| Joe Barnett | Sound Re-Recording Mixer |
| Adrian Popescu | Special Effects Supervisor |
| Adi Handac | Property Master |
| Oana Draghici | Costume Supervisor |
| Domnica Bodogan | Hairstylist |
| Mara Rouse | Makeup Artist |
| B. J. McDonnell | Camera Operator |
| Damian Montano | Musician |
| Liliana Toma | Casting |
| Cory Geryak | Additional Director of Photography |
| Liviu Popa | Electrician |
| Eleanor Sabaduquia | Makeup Department Head |
| Sharon Gilham | Costume Design |
| Rose Wicksteed | Casting |
| John Loranger | Foley |
| John Sievert | Foley Artist |
| Nick Roberts | ADR Mixer |
| Gary Dauberman | Screenplay |
| Gary Dauberman | Story |
| Alina Petrini | Art Department Coordinator |
| Marin Constantin Gabriel | Boom Operator |
| Carol Kiefer | Art Department Coordinator |
| Rasvan Puiu | Stunt Coordinator |
| Don Lee | Visual Effects Supervisor |
| Kim Lee | Visual Effects Producer |
| Justin M. Lubin | Still Photographer |
| Ronald Eng | Supervising Sound Editor |
| Sean Mannion | Property Master |
| Bill R. Dean | Supervising Sound Editor |
| Gabriel J. Serrano | Sound Re-Recording Mixer |
| Lise Richardson | Music Editor |
| Bogdan Stanciu | Steadicam Operator |
| Cos Aelenei | Still Photographer |
| Corin Hardy | Director |
| Eusebiu Sirbu | Graphic Designer |
| Bruce Tanis | Sound Effects Editor |
| Florin Niculae | Gaffer |
| Andrei Cretan | First Assistant "A" Camera |
| James Ferrera | Unit Publicist |
| John Grower | Digital Compositor |
| Michel Aller | Editor |
| Relu Cojanu | Transportation Coordinator |
| Cassandra Parigian | Set Costumer |
| Valentin Mircea | Camera Operator |
| Iulia Roșeanu | Key Makeup Artist |
| Bradley Gaines | Compositor |
| Adelina Handuri | Key Hair Stylist |
| Philip Beckner | Digital Intermediate Colorist |
| Kim Donovan | Stand In |
| Diana Ghinea | Assistant Art Director |
| Florin Mihalache | Rigging Gaffer |
| Joe Schiff | Dialogue Editor |
| Eric R. Brodeur | First Assistant Editor |
| Charley Gilleran | Key Rigging Grip |
| Robert Sharman | Production Sound Mixer |
| Ando Johnson | Sound Effects Editor |
| Nate Underkuffler | Music Editor |
| Jeremy Bramer | Makeup Artist |
| Ken Barthelmey | Concept Artist |
| Sandra Rosko | Stand In |
| Martin Maguire | Still Photographer |
| Monica Duta | Production Coordinator |
| Nicolae Radu | Sound Mixer |
| Sarmis Stamatescu | Transportation Captain |
| Martin L. Mercer | Storyboard Artist |
| Octavian Sotir | Second Assistant "A" Camera |
| Clint Schultz | Graphic Designer |
| Daniela Medeiros | Set Designer |
| Esben Syberg | Visual Effects Supervisor |
| Judah Getz | ADR Mixer |
| Joe Macaluso | Key Grip |
| Petre Victor | First Assistant "B" Camera |
| Dinica Tiberiu | Props |
| Catalin Ciobanu | Electrician |
| Radu Marinescu | Key Grip |
| Adam Boyd | Sound Effects Editor |
| Mark Griffith | Digital Intermediate Colorist |
| Marco Fabriziani | Drone Pilot |
| Alexandra Voloaca | Set Costumer |
| David Feinsilber | Visual Effects Producer |
| Charley Stauber | Assistant Sound Editor |
| Gina Luciani | Musician |
| Nicholas Kaat | Gaffer |
| Mihai Cosmin Popa | Digital Imaging Technician |
| Camilla Carniello | Camera Trainee |
| Catalin Chiorean | Electrician |
| Marcu Ion | Electrician |
| Maggie Mannion | Assistant Property Master |
| Craig Bauer | Additional Photography |
| Sarbu Gigi | Grip |
| Ionut Penzes | Assistant Production Coordinator |
| Kristi McIntyre | Foley Editor |
| Jessica Choi | Visual Effects Coordinator |
| Magnus Hilding-Nørkjær | Digital Compositor |
| John Gorman | Gaffer |
| Scott Parker | Post Production Accountant |
| Negoita Mihai | Libra Head Technician |
| Greg Curry | Additional Colorist |
| Chris Dawson | Digital Compositor |
| Michael Hubert | Production Coordinator |
| Matthew Ribeiro | Matte Painter |
| John F. Soria | Carpenter |
| Jessica McDonald | Greensman |
| Charlie Jaramillo | Greensman |
| Moldoveanu Constantin | Assistant Camera |
| George Budescu | Assistant Camera |
| Erdem Ertal | Additional Photography |
| Ioana Florescu | Digital Imaging Technician |
| Jason Bauer | Digital Imaging Technician |
| Dane Brehm | Digital Imaging Technician |
| Mihai Adrian Olteanu | Electrician |
| Josh Greer | First Assistant "B" Camera |
| Alexandru Bogdan Stefan | Grip |
| Octavian Golgot | Key Rigging Grip |
| Mike Mauceri | Lighting Technician |
| Andrew Sykes | Rigging Grip |
| Mark Droter | Casting Assistant |
| Sophie Kingston-Smith | Casting Assistant |
| Alexandra Ioana Mojoiu | Casting Assistant |
| Alexis Winter | Casting Associate |
| Daniela Soare | Extras Casting |
| Mariana Grama | Extras Casting Assistant |
| John Carner | Assistant Editor |
| Razvan Ilinca | Assistant Editor |
| Steven Trapani | First Assistant Editor |
| Arlo Brooks | Post Production Assistant |
| Vlad Semenescu | Assistant Production Coordinator |
| Johanna L. Williams | Assistant Production Coordinator |
| Holly Dellocono | Assistant Production Coordinator |
| Coleen Aiello | First Assistant Accountant |
| Christopher Billig | Main Title Designer |
| Joel Tokarsky | Production Accountant |
| Kershaun Scott | Production Assistant |
| Ionut Sirbu | Production Assistant |
| Victor Focheanu | Production Assistant |
| Ali Griffith | Production Coordinator |
| Jennifer Johnson | Musician |
| Blake Cooper | Musician |
| Steve Lederer | Assistant Sound Editor |
| Xiao'ou Olivia Zhang | Sound Effects Editor |
| Joseph Silva | Compositor |
| Gabriel Köerner | Digital Compositor |
| Daniel Svaboe | Digital Compositor |
| Alexander Swahn | Digital Compositor |
| Laurens Vermeulen | Digital Compositor |
| Patrik Windahl | Digital Compositor |
| Viktor Östergren | Digital Compositor |
| Kerry Graham | Lighting Artist |
| Melvyn Nicholls | Visual Effects Coordinator |
| Jeff Winkle | Visual Effects Coordinator |
| Shannon Pitts | Special Effects |
