| Rupert Everett | Camilla Fritton |
| Colin Firth | Geoffrey Waites |
| Sarah Harding | Roxy |
| Celia Imrie | Matron of St. Trinian's |
| Toby Jones | Bursar |
| Montserrat Lombard | Zoe |
| Fenella Woolgar | Actor |
| Gemma Arterton | Kelly |
| David Tennant | Lord Pomfrey |
| Tamsin Egerton | Chelsea |
| Juno Temple | Celia |
| Talulah Riley | Annabelle Fritton |
| Jodie Whittaker | Beverly |
| Ella Smith | Lucy |
| Zawe Ashton | Bianca |
| Christian Brassington | Peters |
| Gabriella Wilde | Saffy |
Technical Credits
| Oliver Parker | Director,Producer |
| Barnaby Thompson | Director,Producer |
| Piers Ashworth | Screenwriter |
| Lucy Bevan | Casting |
| Paul Brett | Executive Producer |
| Sheila Burgel | Musical Direction/Supervision |
| Kirstin Chalmers | Makeup |
| Chris Smith | Executive Producer |
| Rupert Everett | Executive Producer |
| Nigel Green | Executive Producer |
| Rebecca Hale | Costumes/Costume Designer |
| Emma E. Hickox | Editor |
| David Higgs | Cinematographer |
| Mark Hubbard | Co-producer |
| Amanda McArthur | Production Designer |
| Sophie Meyer | Co-producer |
| Charlie Mole | Score Composer |
| Nick Moorcroft | Screenwriter |
| Ian Neil | Musical Direction/Supervision |
| Tim Smith | Executive Producer |
| James Spring | Executive Producer |
