 | Evanna Lynch als Emily |
 | Michael Smiley als Robert |
 | George Webster als Arden |
 | Deirdre Mullins als Emily's Mother |
 | Cathy Belton als Greasy Haired Teacher |
 | Martin McCann als Swimming Teacher |
 | Barry McGovern als Dr. Golding |
 | Stella McCusker als Granny |
 | Declan Conlon als Arden's father |
 | Dónall Ó Héalai als Young Policeman |
 | Ally Ni Chiarain als June |
| Laura Matassa als Midwife |
 | John Travers als Square Head |
| Sarah Minto als Young Emily |
 | Michael Hough als Peter Spade |
| Ali White als Arden's Mother |
| Millie Donnelly als Newborn Emily |
| Ann Marie Murray als Robert's school Groupie |
| Catherine Walsh als Nurse |
| Loui Vangelder als Steve |
| Sadie Fitzmaurice als Toddler Emily |
| Hunter Fitzmaurice als Toddler Emily |
| Conor Knox als Male Student |
| Kai Power als Young Arden |
| Kate Parry als Trapeze Artist |
| Bobby Calloway als Bored Student (uncredited) |
| Meghan Jones als Girl Swimming (uncredited) |
| Peter Robbie als Fan in Bookshop (uncredited) |
| Simon Fitzmaurice | Screenplay |
| Seamus Deasy | Director of Photography |
| Simon Fitzmaurice | Director |
| Emer Reynolds | Editor |
| Lesley McKimm | Producer |
| Kathryn Kennedy | Producer |
| Mimmi Spång | Co-Producer |
| Rebecka Lafrenz | Co-Producer |
| Finn Gjerdrum | Co-Producer |
| Stein B. Kvae | Co-Producer |
| Jackie Larkin | Executive Producer |
| John Hand | Production Design |
| Stephen McKeon | Music |
| Judith Williams | Costume Designer |
| Amy Rowan | Casting |
| Dearbhla Regan | Script Editor |
| Lyndzi Doyle | Production Coordinator |
| Des Martin | Line Producer |
| Dermot Cleary | Location Manager |
| Glenn Delaney | First Assistant Director |
| Tricia Perrott | Post Production Supervisor |
| Anna Harrison | Second Assistant Director |
| Sonja Otto | Third Assistant Director |
| Fiona Bonnie | Extras Casting Coordinator |
| Andrea Ainsworth | Dialogue Coach |
| Ivan McCullough | Additional Director of Photography |
| Joel Conroy | Underwater Director of Photography |
| Ray Carlin | Steadicam Operator |
| Kathleen Weir | Script Supervisor |
| Ken Olsson | Production Sound Mixer |
| Lesley Oakley | Art Direction |
| Luke Peters | Graphic Designer |
| Valerie Kelly | Costume Supervisor |
| Cathy Young | Seamstress |
| Sharon Doyle | Key Makeup Artist |
| Martina McCarthy | Key Hair Stylist |
| Martin Hayes | Construction Manager |
| Paddy Condren | Armorer |
| Brendan Condren | Stunt Coordinator |
| Alistair Rumball | Marine Coordinator |
| Emer Reynolds | Second Unit Director |
| Ciarán Tanham | Second Unit Director of Photography |
| Sean Corcoran | Second Unit Director of Photography |
| Kate McCullough | Second Unit Director of Photography |
| Robert O'Connor | Assistant Editor |
| Martin Fanning | Assistant Editor |
| Cian McKenna | Title Designer |
| Fredrik Dalenfjäll | Sound Supervisor |
| Mattias Eklund | Sound Re-Recording Mixer |
| Susanne Kujala | Sound Post Production Coordinator |
| Mattias Eklund | Sound Effects Editor |
| Fredrik Dalenfjäll | Sound Effects Editor |
| Jens Johansson | Sound Effects Editor |
| Nicklas Lindh | Dialogue Editor |
| Fionn Higgins | Sound Re-Recording Mixer |
| Deborah Doherty | Audio Post Coordinator |
| Sean Wheelan | Visual Effects Producer |
| Elin Plantin | Visual Effects Coordinator |
| Christian Lindholm | Visual Effects Supervisor |
| Ciara Gillan | Visual Effects Producer |
| Gill Ryder | Visual Effects Coordinator |
| Ditch Doy | Visual Effects Supervisor |
| Ciaran Crowley | Visual Effects Producer |
| Aidan Kavanagh | Music Consultant |
| Ciarán Byrne | Sound Engineer |
| Til Frohlich | Art Direction |
