| 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) |
| Rose Leslie | Gwen Dawson |
| Phyllis Logan | Mrs. Hughes |
| Elizabeth McGovern | Cora Crawley, Countess of Grantham |
| Sophie McShera | Daisy Robinson |
| Lesley Nicol | Mrs. Patmore |
| Maggie Smith | Violet Crawley, Dowager Countess of Grantham |
| Dan Stevens | Matthew Crawley |
| Penelope Wilton | Isobel Crawley |
| Charlie Cox | Duke of Crowborough |
| Jonathan Coy | George Murray |
| Lionel Guyett | Taylor |
| Jonathan Jaynes | Postmaster |
| Perry Millward | Paperboy |
| Helen Sheals | Postmistress |
| Peter Agnelli | Villager
(uncredited) |
| Filippo Delaunay | Villager
(uncredited) |