 | Nicholas Hoult als J.R.R. Tolkien |
 | Lily Collins als Edith Bratt |
 | Colm Meaney als Father Francis Morgan |
 | Derek Jacobi als Professor Joseph Wright |
 | Harry Gilby als Young J.R.R. Tolkien |
 | Mimi Keene als Young Edith Bratt |
 | Anthony Boyle als Geoffrey Bache Smith |
 | Adam Bregman als Young Geoffrey Bache Smith |
 | Patrick Gibson als Robert Q. Gilson |
 | Albie Marber als Young Robert Q. Gilson |
 | Tom Glynn-Carney als Christopher Wiseman |
 | Ty Tennant als Young Christopher Wiseman |
 | Craig Roberts als Private Sam Hodges |
 | Pam Ferris als Mrs. Faulkner |
 | James MacCallum als Hilary Tolkien |
 | Guillermo Bedward als Young Hilary Tolkien |
 | Laura Donnelly als Mabel Tolkien |
 | Genevieve O'Reilly als Mrs. Smith |
 | Owen Teale als Headmaster Gilson |
 | Al Bollands als First Soldier |
| Kallum Tolkien als Second Soldier |
 | Nia Gwynne als Bronwen |
 | Adrian Schiller als English Master |
| Toby Nash als Mackintosh |
| Michael Bryceson als Goodson-Thomas |
| Andrew Bissell als Rugby Coach |
 | Sian Crisp als Waitress |
| Antony Raymond Barlow als Maître d' |
| David Puckridge als Box Office Man |
 | David Bromley als Schoolmaster |
| Lara Maguire als Rose |
| Holly Dempster als Beryl |
| Jane Dixon-Rowland als Mary |
| David Birkbeck als Porter |
| Colin Macdonald Burnie als Professor #1 |
| Andy Orchard als Professor #2 |
| Frank Kerr als Drunken Student |
| Rob Rhys Bond als Photographer |
 | Joel Phillimore als Lieutenant |
| John Bradfield als Student |
| Mia Woods als Priscilla Tolkien (Child) |
| Sienna Woods als Priscilla Tolkien (Child) |
| Paul Gurcel Escudero als Michael Tolkien (Child) |
 | Harry Webster als John Tolkien Jnr. (Child) |
| Jack Riley als Christopher Tolkien (Child) |
| Dome Karukoski | Director |
| David Gleeson | Screenplay |
| Stephen Beresford | Screenplay |
| Peter Chernin | Producer |
| Jenno Topping | Producer |
| David Ready | Producer |
| David Appleby | Still Photographer |
| Antti Lahtinen | First Assistant Director |
| Harri Ylönen | Editor |
| Kris Thykier | Producer |
| Grant Montgomery | Production Design |
| Thomas Newman | Original Music Composer |
| Lasse Frank Johannessen | Director of Photography |
| Dan Finlay | Co-Producer |
| Sarada McDermott | Co-Producer |
| Colleen Kelsall | Costume Designer |
| Kate Ringsell | Casting |
| Sarah Bridge | Music Supervisor |
| Sarah Franzl | Stunt Coordinator |
| Nancy Bray | Unit Production Manager |
| Stuart Renfrew | First Assistant Director |
| Gemma Nunn | Second Assistant Director |
| Pilar Foy | Supervising Art Director |
| Rupert Davies | Visual Effects Supervisor |
| San Davey | Script Supervisor |
| Danny Sheehan | Supervising Sound Editor |
| Matthew Collinge | Supervising Sound Editor |
| Paul Cotterell | Sound Re-Recording Mixer |
| Matthew Collinge | Sound Re-Recording Mixer |
| Paul Cowell | Art Direction |
| Martin Beresford | Sound Mixer |
| Danny Hargreaves | Special Effects Supervisor |
| Jannika Öberg | Production Coordinator |
| Rob Prynne | Sound Designer |
| Martin Cantwell | Sound Designer |
| Paul Carter | Sound Designer |
| Maria Reinup | Second Unit Director |
| Stephan Pehrsson | Second Unit Director of Photography |
| Chey Anich | Stunt Double |
| Ricardo Cruz Jr. | Stunts |
| David Garrick | Stunt Coordinator |
| Evangelos Grecos | Stunts |
| Cristian Knight | Stunts |
| Kye Mckee | Stunts |
| Theo Morton | Stunts |
| Adam Smith | Stunts |
| Nadia Stacey | Makeup Designer |
| Nadia Stacey | Hair Designer |
| Louise Seymour | Post Production Supervisor |
| Chris Gill | Additional Editor |
| Kerry-Ellen Maxwell | Standby Art Director |
| Ben Clements | Assistant Art Director |
| Emma Dorward | Assistant Art Director |
| Clare Griffiths | Art Department Coordinator |
| Mark Nuttall | Storyboard Artist |
| Jonathan Millward | Storyboard Artist |
| Thomas Bassett | Third Assistant Director |
| Camilla Southwell | Crowd Assistant Director |
| Danielle Blaise Taylor | Third Assistant Director |
| Karsten Jacobsen | "A" Camera Operator |
| Karsten Jacobsen | Steadicam Operator |
| Adam Conlon | First Assistant "A" Camera |
| Kerry Arthur | First Assistant "B" Camera |
| Matt Wright | Second Assistant "A" Camera |
| Ben Taylor | Second Assistant "B" Camera |
| Josh Tilley | Camera Trainee |
| James Hogarth | Digital Imaging Technician |
| Juliana Malucelli | Still Photographer |
| Julia Jones | Unit Publicist |
| Martin Beresford | Production Sound Mixer |
| Lee James | First Assistant Sound Editor |
| Chris Crookall | First Assistant Editor |
| Heidi Freeman | First Assistant Editor |
| Abi Wright | Assistant Editor |
| Robert Platt-Higgins | Post Production Coordinator |
| Julian White | Chief Lighting Technician |
| Alan Millar | Best Boy Electric |
| Vinny Cowper | Electrician |
| Max Elliot Lovell | Electrician |
| Michael John McHugh | Rigging Gaffer |
| Josh Close | Key Grip |
| Guy Elliot Smith | Grip |
| April Church | Assistant Costume Designer |
| Deborah Lynn Scott | Assistant Costume Designer |
| Isabella Artitzone | Assistant Costume Designer |
| Bettina Seifert | Costume Supervisor |
| Diana Wyand | Costume Supervisor |
| Tracey Cliffe | Truck Supervisor |
| Laura Bailey | Key Costumer |
| Catherine Hibbert | Key Costumer |
| Dennis Bach Jensen | Tailor |
| Julie McCausland | Seamstress |
| Gerda Lauciute | Makeup Supervisor |
| Gerda Lauciute | Hair Supervisor |
| Anna Morena | Key Hair Stylist |
| Anna Morena | Key Makeup Artist |
| Dani Haigh | Makeup & Hair |
| Niall Monteith-Mann | Makeup & Hair |
| Mandy Sharpe | Location Manager |
| Danny Newton | Assistant Location Manager |
| Kerri Burbidge | Location Coordinator |
| Mackenzie Crossland | Location Assistant |
| James Baylan | Property Master |
| Lyndsey Haluszczak | Assistant Production Coordinator |
| Laura Trigg | Production Secretary |
| Rebecca Norbury | Production Runner |
| Ben Arslanian | Production Accountant |
| El West | Assistant Accountant |
| Becky Scurrah | Assistant Accountant |
| Karen Margaux Walker | Payroll Accountant |
| Claudia Blunt | Casting Associate |
| Hugh O'Shea | Dialogue Coach |
| Toni Staples | Second Unit First Assistant Director |
| Thomas Newman | Conductor |
| J.A.C. Redford | Orchestrator |
| Bill Bernstein | Music Editor |
| Paul Biddiss | Military Consultant |
