 Kristen StewartDiana | Diana |
 Timothy SpallMajor Alistair Gregorys | Major Alistair Gregorys |
 Jack NielenWilliam | William |
 Freddie SpryHarry | Harry |
 Jack FarthingCharles | Charles |
 Sean HarrisDarren | Darren |
 Stella GonetThe Queen | The Queen |
 Richard SammelPrince Philip | Prince Philip |
 Elizabeth BerringtonPrincess Anne | Princess Anne |
 Lore StefanekQueen Mother | Queen Mother |
 Amy MansonAnne Boleyn | Anne Boleyn |
 Sally HawkinsMaggie | Maggie |
 James HarknessFootman Paul | Footman Paul |
 Laura BensonAngela (Dresser) | Angela (Dresser) |
 Wendy PattersonMaria (Older Maid) | Maria (Older Maid) |
 Libby RodliffePamela (Maid) | Pamela (Maid) |
 John KeoghMichael (Charles' Valet) | Michael (Charles' Valet) |
 Marianne GraffamBarbara (Nanny) | Barbara (Nanny) |
 Ben Plunkett-ReynoldsFootman Brian | Footman Brian |
| RRyan WichertStaff Sergeant Wood | Staff Sergeant Wood |
 Michael EppLance Corporal Jacobs | Lance Corporal Jacobs |
 Tom HudsonPolice Constable Thomas | Police Constable Thomas |
 James GerardPolice Constable Field | Police Constable Field |
| TThomas DouglasJohn Spencer | John Spencer |
| IIan AshpitelVicar | Vicar |
| EEmma Darwall SmithCamilla Parker Bowles | Camilla Parker Bowles |
| KKimia SchmidtDiana (9 Years) | Diana (9 Years) |
| GGreta BückerDiana (Late Teenage Years) | Diana (Late Teenage Years) |
| HHenry CastelloCharles Spencer (9 Years) | Charles Spencer (9 Years) |
| CChristin SchreiberAlter Ego Diana | Alter Ego Diana |
