| Hugh Bonneville | Robert Crawley, Earl of Grantham |
| Laura Carmichael | Lady Edith Crawley |
| Jim Carter | Charles Carson |
| Raquel Cassidy | Baxter |
| Brendan Coyle | John Bates |
| Michelle Dockery | Lady Mary Crawley |
| Kevin Doyle | Joseph Molesley |
| Michael Fox | Andy |
| Joanne Froggatt | Anna Bates |
| Matthew Goode | Henry Talbot |
| Robert James-Collier | Thomas Barrow |
| Allen Leech | Tom Branson |
| Phyllis Logan | Mrs. Hughes |
| Elizabeth McGovern | Cora Crawley, Countess of Grantham |
| Sophie McShera | Daisy Mason |
| Lesley Nicol | Mrs. Patmore |
| Maggie Smith | Violet Crawley, Dowager Countess of Grantham |
| Penelope Wilton | Isobel Crawley |
| Sebastian Dunn | Charlie Rogers |
| Christos Lawton | Billy |
| Phoebe Sparrow | Amelia Cruikshank |
| Jeremy Swift | Spratt |
| Sue Johnston | Miss Denker |
| Paul Copley | Mr. Mason |
| Antonia Bernath | Laura Edmunds |
| Samantha Bond | Lady Rosamund Painswick |
| Harry Hadden-Paton | Bertie Pelham |
| Peter Hamilton Dyer | Racing Commentator |
| Patrick Brennan | Mr. Dawes |
| Hayley Jayne Standing | Lucy |
| Jake Rowley | Paparazzo |
| Oliver Barker | George Crawley
(uncredited) |
| Zac Barker | George Crawley
(uncredited) |
| Richard Bevan | Dr. Harrison
(uncredited) |
| Victoria Emslie | Audrey
(uncredited) |
| Sarah Maddocks | Emily
(uncredited) |
| Shaun Newnham | Mechanic
(uncredited) |
| Dan Noye | Upperclass Gentleman 3
(uncredited) |
| Ross O'Connor | Racing Driver #7
(uncredited) |
| Vanessa Quiney | B&B Guest
(uncredited) |