| Hugh Bonneville | Robert Crawley, Earl of Grantham |
| Jessica Brown Findlay | Lady Sybil Crawley |
| Laura Carmichael | Lady Edith Crawley |
| Jim Carter | Charles Carson |
| Brendan Coyle | John Bates |
| Michelle Dockery | Lady Mary Crawley |
| Siobhan Finneran | Sarah O'Brien |
| Joanne Froggatt | Anna Smith |
| Thomas Howes | William Mason |
| Robert James-Collier | Thomas Barrow
(as Rob James-Collier) |
| Phyllis Logan | Mrs. Hughes |
| Elizabeth McGovern | Cora Crawley, Countess of Grantham |
| Sophie McShera | Daisy Robinson |
| Lesley Nicol | Mrs. Patmore |
| Amy Nuttall | Ethel Parks |
| Maggie Smith | Violet Crawley, Dowager Countess of Grantham |
| Dan Stevens | Matthew Crawley |
| Penelope Wilton | Isobel Crawley |
| Samantha Bond | Lady Rosamund Painswick |
| Zoe Boyle | Lavinia Swire |
| Thomas Campbell | Captain Smiley
(as Tom Feary-Campbell) |
| Allen Leech | Tom Branson |
| Cal MacAninch | Henry Lang |
| Graham Padden | Army Doctor |
| Daniel Pirrie | Major Charles Bryant |
| David Robb | Dr. Clarkson |
| Julian Wadham | General Sir Herbert Strutt |
| Peter Agnelli | Villager
(uncredited) |
| Giles Spencer | Officer
(uncredited) |