 | Brendan Gleeson als Father James Lavelle |
 | Chris O'Dowd als Jack Brennan |
 | Kelly Reilly als Fiona Lavelle |
 | Aidan Gillen als Dr. Frank Harte |
 | Dylan Moran als Michael Fitzgerald |
 | Isaach De Bankolé als Simon |
 | M. Emmet Walsh als The Writer |
 | Marie-Josée Croze als Teresa |
 | Domhnall Gleeson als Freddie Joyce |
 | David Wilmot als Father Leary |
 | Pat Shortt als Brendan Lynch |
 | Gary Lydon als Inspector Stanton |
 | Killian Scott als Milo Herlihy |
 | Orla O'Rourke als Veronica Brennan |
 | Owen Sharpe als Leo |
 | David McSavage als Bishop Garret Montgomery |
 | Mícheál Óg Lane als Mícheál |
 | Mark O'Halloran als Prison Officer |
 | Declan Conlon als Father |
 | Anabel Sweeney als Girl |
| John Michael McDonagh | Writer |
| John Michael McDonagh | Director |
| Flora Fernández-Marengo | Producer |
| James Flynn | Producer |
| Chris Clark | Producer |
| Larry Smith | Director of Photography |
| Jina Jay | Casting |
| Mark Geraghty | Production Design |
| Chris Gill | Editor |
| Patrick Cassidy | Original Music Composer |
| Robert Flanagan | Production Sound Mixer |
| Jonathan Hession | Still Photographer |
| Eimer Ní Mhaoldomhnaigh | Costume Design |
| Jeanette McGrath | Script Supervisor |
| Elizabeth Eves | Co-Producer |
| Aaron Farrell | Co-Producer |
| Joe Condren | Stunt Coordinator |
| Ronan Flynn | Executive Producer |
| Fiona Daly | Art Direction |
| Peter Hampden | Executive Producer |
| Patrick O'Donoghue | Line Producer |
| Robert Walak | Executive Producer |
| Liz Gallacher | Music Supervisor |
| Jackson C. Frank | Songs |
| Ian Wilson | Supervising Sound Editor |
| Paul Cotterell | Sound Re-Recording Mixer |
| Lorraine Brennan | Assistant Hairstylist |
| Orla Carrol | Hairdresser |
| Morna Ferguson | Makeup Designer |
| Niamh O'Loan | Assistant Makeup Artist |
| Martina McCarthy | Hairstylist |
| Dolly Ryan | Makeup Artist |
| Ann Lynch | Post Production Supervisor |
| Fiona Morham | Head of Production |
| Peter Agnew | First Assistant Director |
| Sandra Corbally | Third Assistant Director |
| David Kennedy | Extras Casting Coordinator |
| Maeve O'Sullivan | Second Assistant Director |
| Thomas Arkins | Runner Art Department |
| Paul Brady | Graphic Designer |
| Anthony Brannigan | Standby Painter |
| Pat Byrne | Dressing Prop |
| Melanie Downes | Standby Art Director |
| Michael Freaney | Standby Rigger |
| Neville Gaynor | Scenic Artist |
| Gavin Hackett | Carpenter |
| Paul Hedges Jr. | Property Master |
| Donald Hempenstall | Carpenter |
| John Kavanagh | Carpenter |
| Niall Kearney | Painter |
| Tony Kennedy | Standby Carpenter |
| Keavy Lalor | Property Buyer |
| Fred Lee | Carpenter |
| Nicky MacManus | Construction Manager |
| Feargus McHugh | Construction Manager |
| Joseph Murray | Carpenter |
| Richard Murray | Carpenter |
| Pippa O'Neill | Art Department Trainee |
| Brian Tighe | Carpenter |
| Neill Treacy | Art Department Trainee |
| Graham Waters | Supervising Carpenter |
| Alan Lambert | Painter |
| Eleonora McNamara | Sculptor |
| Merlin Bonning | Boom Operator |
| Paula Boram | Foley Artist |
| Sandy Buchanan | Foley Mixer |
| Paul Cotterell | Dialogue Editor |
| Paul Hanks | Foley Artist |
| Rob Hughes | ADR Mixer |
| Tushar Manek | Sound Assistant |
| Sam Southwick | ADR Editor |
| Simon Trundle | Foley Editor |
| Kevin Byrne | Special Effects Coordinator |
| Liam McDonald | Special Effects Technician |
| Kevin Nolan | Special Effects Technician |
| Pat Redmond | Special Effects Technician |
| Harry Wormald | Matte Painter |
| Sheila Wickens | Visual Effects Supervisor |
| Lucy Tanner | Visual Effects Producer |
| Katie Roehrick | Visual Effects Production Manager |
| Elizabeth Clyne | Stunt Double |
| Andrew Kilfeather | Stunt Double |
| Stephen Kilfeather | Stunt Double |
| Cian Logue | Stunt Double |
| Barry Mottershead | Stunt Double |
| Christine Ayoub | Second Assistant "B" Camera |
| Jeremy Braben | Aerial Director of Photography |
| Roman Bugovskiy | Camera Trainee |
| Peter Clyne | Camera Intern |
| Sean Creagh | Generator Operator |
| Russell Gleeson | Camera Operator |
| David Grennan | Camera Operator |
| Conor Hammond | First Assistant "C" Camera |
| Eoin Keating | First Assistant "B" Camera |
| Simon Keenan | Camera Trainee |
| Stephen McCarthy | Gaffer |
| Louise McEllin | Second Assistant "A" Camera |
| Kelly McLaughlin | Electrician |
| Cormac O'Maille | First Assistant "B" Camera |
| Mike Scott | Steadicam Operator |
| Adam Tsan | Key Grip |
| Jonas Vingilys | Camera Trainee |
| Derek Walker | Camera Operator |
| Derek Walker | Steadicam Operator |
| Dara Walsh | Camera Intern |
| Paul Wheeldon | First Assistant "A" Camera |
| Jessie Frost | Casting Assistant |
| Debbie Millington | Wardrobe Supervisor |
