 | David Rawle als Ben (voice) |
 | Lucy O'Connell als Saoirse (voice) |
 | Brendan Gleeson als Conor / Mac Lir (voice) |
 | Fionnula Flanagan als Granny / Macha (voice) |
 | Pat Shortt als Lug (voice) |
 | Jon Kenny als Ferry Dan / The Great Seanachaí (voice) |
 | Lisa Hannigan als Bronach (voice) |
 | Colm Ó'Snodaigh als Mossy (voice) |
 | Liam Hourican als Spud / Bus Driver (voice) |
| Kevin Swierszcz als Young Ben (voice) |
| Will Collins als Additional Voices (voice) |
 | Paul Young als Additional Voices |
| Will Collins | Writer |
| Tomm Moore | Director |
| Katja Schumann | Production Manager |
| Tomm Moore | Story |
| Darragh Byrne | Editor |
| Bruno Coulais | Original Music Composer |
| Claus Toksvig Kjaer | Production Manager |
| Pascal Nowak | Color Designer |
| Clément Calvet | Co-Producer |
| Marc Umé | Software Engineer |
| Marc Umé | Visual Effects Supervisor |
| Eric Dupont | Visual Effects Supervisor |
| Joshua Jason | Publicist |
| Tomm Moore | Producer |
| Garret Farrell | Recording Supervision |
| Darren T. Holmes | Editorial Coordinator |
| Nora Twomey | Other |
| Slaven Reese | Animation |
| Paul Young | Producer |
| Ross Stewart | Art Department Coordinator |
| Alfredo Cassano | Animation |
| Giovanna Ferrari | Animation |
| Geoff King | Animation |
| Susana Grilo | Production Intern |
| Stéphan Roelants | Co-Producer |
| Ross Murray | Producer |
| Virgile Bage | Animation |
| Ole Christian Løken | Animation |
| Nostradine Benguezzou | Sound Re-Recording Mixer |
| Fabian Erlinghäuser | Animation Director |
| Stuart Shankly | First Assistant Director |
| Marie Doyeux | Sound Re-Recording Mixer |
| Tomislav Findrik | Animation |
| Marion Roussel | Animation |
| François Crèvecoeur | VFX Artist |
| Kila | Additional Music |
| Serge Umé | Co-Producer |
| Stine Sæthre | Animation |
| Patrice Renson | Conductor |
| Samuel Feller | Associate Producer |
| Danas Berznitsky | Animation |
| Marie Thorhauge | Character Designer |
| Thibaut Ruby | Line Producer |
| Frederik Villumsen | Producer |
| Sandra Norup Andersen | Character Designer |
| Adi Merigeau | Art Direction |
| Michel Hick | Software Engineer |
| Frederik Villumsen | Animation Director |
| Isabelle Truc | Co-Producer |
| Atshong Chen | Production Accountant |
| Alessandra Sorrentino | Animation |
| Tod Polson | Thanks |
| Alessandra Sorrentino | Storyboard Designer |
| Santiago López Jover | Animation |
| Jérémie Fajner | Co-Producer |
| Walter Giampaglia | Animation |
| Denis Figueiredo | Animation |
| Mathilde Vachet | Animation |
| Sidonie Vidal | Background Designer |
| Fabian Erlinghäuser | First Assistant Director |
| Alexandre Jaclain | Sound Designer |
| Louise Bergholt Sørensen | Animation |
| Rosa Ballester Cabo | Character Designer |
| Jeremy Purcell | Visual Effects Supervisor |
| Adi Merigeau | Production Design |
| Svend Andreas Rothmann Bonde | Animation |
| Félix Davin | Sound Designer |
