| 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 |
| Kevin Doyle | Joseph Molesley |
| Howard Gossington | Veteran |
| Allen Leech | Tom Branson |
| Christine Lohr | Mrs. Bird |
| Daniel Pirrie | Major Charles Bryant |
| David Robb | Dr. Clarkson |
| Nicholas Blatt | Brookes, Sir Richards Valet
(uncredited) |
| Laura Jeanne | Nurse
(uncredited) |
| Giles Spencer | Officer
(uncredited) |