Nicholas Hoult (J.R.R. Tolkien), Lily Collins (Edith Bratt), Colm Meaney (Father Francis Morgan), Derek Jacobi (Professor Joseph Wright), Harry Gilby (Young J.R.R. Tolkien), Mimi Keene (Young Edith Bratt), Anthony Boyle (Geoffrey Bache Smith) more..., Adam Bregman (Young Geoffrey Bache Smith), Patrick Gibson (Robert Q. Gilson), Albie Marber (Young Robert Q. Gilson), Tom Glynn-Carney (Christopher Wiseman), Ty Tennant (Young Christopher Wiseman), Craig Roberts (Private Sam Hodges), Pam Ferris (Mrs. Faulkner), James MacCallum (Hilary Tolkien), Guillermo Bedward (Young Hilary Tolkien), Laura Donnelly (Mabel Tolkien), Genevieve O'Reilly (Mrs. Smith), Owen Teale (Headmaster Gilson), Al Bollands (First Soldier), Kallum Tolkien (Second Soldier), Nia Gwynne (Bronwen), Adrian Schiller (English Master), Toby Nash (Mackintosh), Michael Bryceson (Goodson-Thomas), Andrew Bissell (Rugby Coach), Sian Crisp (Waitress), Antony Raymond Barlow (Maître d'), David Puckridge (Box Office Man), David Bromley (Schoolmaster), Lara Maguire (Rose), Holly Dempster (Beryl), Jane Dixon-Rowland (Mary), David Birkbeck (Porter), Colin Macdonald Burnie (Professor #1), Andy Orchard (Professor #2), Frank Kerr (Drunken Student), Rob Rhys Bond (Photographer), Joel Phillimore (Lieutenant), John Bradfield (Student) and others.

David Gleeson (Screenplay), Stephen Beresford (Screenplay), Peter Chernin (Producer), Jenno Topping (Producer), David Ready (Producer), David Appleby (Still Photographer), Antti Lahtinen (First Assistant Director) more..., 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), Chris Gill (Additional Editor), Karsten Jacobsen (Steadicam Operator), Karsten Jacobsen ("A" Camera Operator) and others.